obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 4181 insertions, 0 deletions

diff --git a/gcc/fortran/io.c b/gcc/fortran/io.c
new file mode 100644
index 000000000..b0f3ebe4a
--- /dev/null
+++ b/gcc/fortran/io.c
@@ -0,0 +1,4181 @@
+/* Deal with I/O statements & related stuff.
+   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+   2009, 2010, 2011
+   Free Software Foundation, Inc.
+   Contributed by Andy Vaught
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "flags.h"
+#include "gfortran.h"
+#include "match.h"
+#include "parse.h"
+
+gfc_st_label
+format_asterisk = {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL,
+		   0, {NULL, NULL}};
+
+typedef struct
+{
+  const char *name, *spec, *value;
+  bt type;
+}
+io_tag;
+
+static const io_tag
+	tag_file	= {"FILE", " file =", " %e", BT_CHARACTER },
+	tag_status	= {"STATUS", " status =", " %e", BT_CHARACTER},
+	tag_e_access	= {"ACCESS", " access =", " %e", BT_CHARACTER},
+	tag_e_form	= {"FORM", " form =", " %e", BT_CHARACTER},
+	tag_e_recl	= {"RECL", " recl =", " %e", BT_INTEGER},
+	tag_e_blank	= {"BLANK", " blank =", " %e", BT_CHARACTER},
+	tag_e_position	= {"POSITION", " position =", " %e", BT_CHARACTER},
+	tag_e_action	= {"ACTION", " action =", " %e", BT_CHARACTER},
+	tag_e_delim	= {"DELIM", " delim =", " %e", BT_CHARACTER},
+	tag_e_pad	= {"PAD", " pad =", " %e", BT_CHARACTER},
+	tag_e_decimal	= {"DECIMAL", " decimal =", " %e", BT_CHARACTER},
+	tag_e_encoding	= {"ENCODING", " encoding =", " %e", BT_CHARACTER},
+	tag_e_async	= {"ASYNCHRONOUS", " asynchronous =", " %e", BT_CHARACTER},
+	tag_e_round	= {"ROUND", " round =", " %e", BT_CHARACTER},
+	tag_e_sign	= {"SIGN", " sign =", " %e", BT_CHARACTER},
+	tag_unit	= {"UNIT", " unit =", " %e", BT_INTEGER},
+	tag_advance	= {"ADVANCE", " advance =", " %e", BT_CHARACTER},
+	tag_rec		= {"REC", " rec =", " %e", BT_INTEGER},
+	tag_spos	= {"POSITION", " pos =", " %e", BT_INTEGER},
+	tag_format	= {"FORMAT", NULL, NULL, BT_CHARACTER},
+	tag_iomsg	= {"IOMSG", " iomsg =", " %e", BT_CHARACTER},
+	tag_iostat	= {"IOSTAT", " iostat =", " %v", BT_INTEGER},
+	tag_size	= {"SIZE", " size =", " %v", BT_INTEGER},
+	tag_exist	= {"EXIST", " exist =", " %v", BT_LOGICAL},
+	tag_opened	= {"OPENED", " opened =", " %v", BT_LOGICAL},
+	tag_named	= {"NAMED", " named =", " %v", BT_LOGICAL},
+	tag_name	= {"NAME", " name =", " %v", BT_CHARACTER},
+	tag_number	= {"NUMBER", " number =", " %v", BT_INTEGER},
+	tag_s_access	= {"ACCESS", " access =", " %v", BT_CHARACTER},
+	tag_sequential	= {"SEQUENTIAL", " sequential =", " %v", BT_CHARACTER},
+	tag_direct	= {"DIRECT", " direct =", " %v", BT_CHARACTER},
+	tag_s_form	= {"FORM", " form =", " %v", BT_CHARACTER},
+	tag_formatted	= {"FORMATTED", " formatted =", " %v", BT_CHARACTER},
+	tag_unformatted	= {"UNFORMATTED", " unformatted =", " %v", BT_CHARACTER},
+	tag_s_recl	= {"RECL", " recl =", " %v", BT_INTEGER},
+	tag_nextrec	= {"NEXTREC", " nextrec =", " %v", BT_INTEGER},
+	tag_s_blank	= {"BLANK", " blank =", " %v", BT_CHARACTER},
+	tag_s_position	= {"POSITION", " position =", " %v", BT_CHARACTER},
+	tag_s_action	= {"ACTION", " action =", " %v", BT_CHARACTER},
+	tag_read	= {"READ", " read =", " %v", BT_CHARACTER},
+	tag_write	= {"WRITE", " write =", " %v", BT_CHARACTER},
+	tag_readwrite	= {"READWRITE", " readwrite =", " %v", BT_CHARACTER},
+	tag_s_delim	= {"DELIM", " delim =", " %v", BT_CHARACTER},
+	tag_s_pad	= {"PAD", " pad =", " %v", BT_CHARACTER},
+	tag_s_decimal	= {"DECIMAL", " decimal =", " %v", BT_CHARACTER},
+	tag_s_encoding	= {"ENCODING", " encoding =", " %v", BT_CHARACTER},
+	tag_s_async	= {"ASYNCHRONOUS", " asynchronous =", " %v", BT_CHARACTER},
+	tag_s_round	= {"ROUND", " round =", " %v", BT_CHARACTER},
+	tag_s_sign	= {"SIGN", " sign =", " %v", BT_CHARACTER},
+	tag_iolength	= {"IOLENGTH", " iolength =", " %v", BT_INTEGER},
+	tag_convert     = {"CONVERT", " convert =", " %e", BT_CHARACTER},
+	tag_strm_out    = {"POS", " pos =", " %v", BT_INTEGER},
+	tag_err		= {"ERR", " err =", " %l", BT_UNKNOWN},
+	tag_end		= {"END", " end =", " %l", BT_UNKNOWN},
+	tag_eor		= {"EOR", " eor =", " %l", BT_UNKNOWN},
+	tag_id		= {"ID", " id =", " %v", BT_INTEGER},
+	tag_pending	= {"PENDING", " pending =", " %v", BT_LOGICAL},
+	tag_newunit	= {"NEWUNIT", " newunit =", " %v", BT_INTEGER};
+
+static gfc_dt *current_dt;
+
+#define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
+
+
+/**************** Fortran 95 FORMAT parser  *****************/
+
+/* FORMAT tokens returned by format_lex().  */
+typedef enum
+{
+  FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
+  FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_LPAREN,
+  FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
+  FMT_E, FMT_EN, FMT_ES, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END,
+  FMT_ERROR, FMT_DC, FMT_DP, FMT_T, FMT_TR, FMT_TL, FMT_STAR, FMT_RC,
+  FMT_RD, FMT_RN, FMT_RP, FMT_RU, FMT_RZ
+}
+format_token;
+
+/* Local variables for checking format strings.  The saved_token is
+   used to back up by a single format token during the parsing
+   process.  */
+static gfc_char_t *format_string;
+static int format_string_pos;
+static int format_length, use_last_char;
+static char error_element;
+static locus format_locus;
+
+static format_token saved_token;
+
+static enum
+{ MODE_STRING, MODE_FORMAT, MODE_COPY }
+mode;
+
+
+/* Return the next character in the format string.  */
+
+static char
+next_char (gfc_instring in_string)
+{
+  static gfc_char_t c;
+
+  if (use_last_char)
+    {
+      use_last_char = 0;
+      return c;
+    }
+
+  format_length++;
+
+  if (mode == MODE_STRING)
+    c = *format_string++;
+  else
+    {
+      c = gfc_next_char_literal (in_string);
+      if (c == '\n')
+	c = '\0';
+    }
+
+  if (gfc_option.flag_backslash && c == '\\')
+    {
+      locus old_locus = gfc_current_locus;
+
+      if (gfc_match_special_char (&c) == MATCH_NO)
+	gfc_current_locus = old_locus;
+
+      if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
+	gfc_warning ("Extension: backslash character at %C");
+    }
+
+  if (mode == MODE_COPY)
+    *format_string++ = c;
+
+  if (mode != MODE_STRING)
+    format_locus = gfc_current_locus;
+
+  format_string_pos++;
+
+  c = gfc_wide_toupper (c);
+  return c;
+}
+
+
+/* Back up one character position.  Only works once.  */
+
+static void
+unget_char (void)
+{
+  use_last_char = 1;
+}
+
+/* Eat up the spaces and return a character.  */
+
+static char
+next_char_not_space (bool *error)
+{
+  char c;
+  do
+    {
+      error_element = c = next_char (NONSTRING);
+      if (c == '\t')
+	{
+	  if (gfc_option.allow_std & GFC_STD_GNU)
+	    gfc_warning ("Extension: Tab character in format at %C");
+	  else
+	    {
+	      gfc_error ("Extension: Tab character in format at %C");
+	      *error = true;
+	      return c;
+	    }
+	}
+    }
+  while (gfc_is_whitespace (c));
+  return c;
+}
+
+static int value = 0;
+
+/* Simple lexical analyzer for getting the next token in a FORMAT
+   statement.  */
+
+static format_token
+format_lex (void)
+{
+  format_token token;
+  char c, delim;
+  int zflag;
+  int negative_flag;
+  bool error = false;
+
+  if (saved_token != FMT_NONE)
+    {
+      token = saved_token;
+      saved_token = FMT_NONE;
+      return token;
+    }
+
+  c = next_char_not_space (&error);
+  
+  negative_flag = 0;
+  switch (c)
+    {
+    case '-':
+      negative_flag = 1;
+    case '+':
+      c = next_char_not_space (&error);
+      if (!ISDIGIT (c))
+	{
+	  token = FMT_UNKNOWN;
+	  break;
+	}
+
+      value = c - '0';
+
+      do
+	{
+	  c = next_char_not_space (&error);
+	  if (ISDIGIT (c))
+	    value = 10 * value + c - '0';
+	}
+      while (ISDIGIT (c));
+
+      unget_char ();
+
+      if (negative_flag)
+	value = -value;
+
+      token = FMT_SIGNED_INT;
+      break;
+
+    case '0':
+    case '1':
+    case '2':
+    case '3':
+    case '4':
+    case '5':
+    case '6':
+    case '7':
+    case '8':
+    case '9':
+      zflag = (c == '0');
+
+      value = c - '0';
+
+      do
+	{
+	  c = next_char_not_space (&error);
+	  if (ISDIGIT (c))
+	    {
+	      value = 10 * value + c - '0';
+	      if (c != '0')
+		zflag = 0;
+	    }
+	}
+      while (ISDIGIT (c));
+
+      unget_char ();
+      token = zflag ? FMT_ZERO : FMT_POSINT;
+      break;
+
+    case '.':
+      token = FMT_PERIOD;
+      break;
+
+    case ',':
+      token = FMT_COMMA;
+      break;
+
+    case ':':
+      token = FMT_COLON;
+      break;
+
+    case '/':
+      token = FMT_SLASH;
+      break;
+
+    case '$':
+      token = FMT_DOLLAR;
+      break;
+
+    case 'T':
+      c = next_char_not_space (&error);
+      switch (c)
+	{
+	case 'L':
+	  token = FMT_TL;
+	  break;
+	case 'R':
+	  token = FMT_TR;
+	  break;
+	default:
+	  token = FMT_T;
+	  unget_char ();
+	}
+      break;
+
+    case '(':
+      token = FMT_LPAREN;
+      break;
+
+    case ')':
+      token = FMT_RPAREN;
+      break;
+
+    case 'X':
+      token = FMT_X;
+      break;
+
+    case 'S':
+      c = next_char_not_space (&error);
+      if (c != 'P' && c != 'S')
+	unget_char ();
+
+      token = FMT_SIGN;
+      break;
+
+    case 'B':
+      c = next_char_not_space (&error);
+      if (c == 'N' || c == 'Z')
+	token = FMT_BLANK;
+      else
+	{
+	  unget_char ();
+	  token = FMT_IBOZ;
+	}
+
+      break;
+
+    case '\'':
+    case '"':
+      delim = c;
+
+      value = 0;
+
+      for (;;)
+	{
+	  c = next_char (INSTRING_WARN);
+	  if (c == '\0')
+	    {
+	      token = FMT_END;
+	      break;
+	    }
+
+	  if (c == delim)
+	    {
+	      c = next_char (INSTRING_NOWARN);
+
+	      if (c == '\0')
+		{
+		  token = FMT_END;
+		  break;
+		}
+
+	      if (c != delim)
+		{
+		  unget_char ();
+		  token = FMT_CHAR;
+		  break;
+		}
+	    }
+	  value++;
+	}
+      break;
+
+    case 'P':
+      token = FMT_P;
+      break;
+
+    case 'I':
+    case 'O':
+    case 'Z':
+      token = FMT_IBOZ;
+      break;
+
+    case 'F':
+      token = FMT_F;
+      break;
+
+    case 'E':
+      c = next_char_not_space (&error);
+      if (c == 'N' )
+	token = FMT_EN;
+      else if (c == 'S')
+        token = FMT_ES;
+      else
+	{
+	  token = FMT_E;
+	  unget_char ();
+	}
+
+      break;
+
+    case 'G':
+      token = FMT_G;
+      break;
+
+    case 'H':
+      token = FMT_H;
+      break;
+
+    case 'L':
+      token = FMT_L;
+      break;
+
+    case 'A':
+      token = FMT_A;
+      break;
+
+    case 'D':
+      c = next_char_not_space (&error);
+      if (c == 'P')
+	{
+	  if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DP format "
+	      "specifier not allowed at %C") == FAILURE)
+	    return FMT_ERROR;
+	  token = FMT_DP;
+	}
+      else if (c == 'C')
+	{
+	  if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DC format "
+	      "specifier not allowed at %C") == FAILURE)
+	    return FMT_ERROR;
+	  token = FMT_DC;
+	}
+      else
+	{
+	  token = FMT_D;
+	  unget_char ();
+	}
+      break;
+
+    case 'R':
+      c = next_char_not_space (&error);
+      switch (c)
+	{
+	case 'C':
+	  token = FMT_RC;
+	  break;
+	case 'D':
+	  token = FMT_RD;
+	  break;
+	case 'N':
+	  token = FMT_RN;
+	  break;
+	case 'P':
+	  token = FMT_RP;
+	  break;
+	case 'U':
+	  token = FMT_RU;
+	  break;
+	case 'Z':
+	  token = FMT_RZ;
+	  break;
+	default:
+	  token = FMT_UNKNOWN;
+	  unget_char ();
+	  break;
+	}
+      break;
+
+    case '\0':
+      token = FMT_END;
+      break;
+
+    case '*':
+      token = FMT_STAR;
+      break;
+
+    default:
+      token = FMT_UNKNOWN;
+      break;
+    }
+
+  if (error)
+    return FMT_ERROR;
+
+  return token;
+}
+
+
+static const char *
+token_to_string (format_token t)
+{
+  switch (t)
+    {
+      case FMT_D:
+	return "D";
+      case FMT_G:
+	return "G";
+      case FMT_E:
+	return "E";
+      case FMT_EN:
+	return "EN";
+      case FMT_ES:
+	return "ES";
+      default:
+        return "";
+    }
+}
+
+/* Check a format statement.  The format string, either from a FORMAT
+   statement or a constant in an I/O statement has already been parsed
+   by itself, and we are checking it for validity.  The dual origin
+   means that the warning message is a little less than great.  */
+
+static gfc_try
+check_format (bool is_input)
+{
+  const char *posint_required	  = _("Positive width required");
+  const char *nonneg_required	  = _("Nonnegative width required");
+  const char *unexpected_element  = _("Unexpected element '%c' in format string"
+				      " at %L");
+  const char *unexpected_end	  = _("Unexpected end of format string");
+  const char *zero_width	  = _("Zero width in format descriptor");
+
+  const char *error;
+  format_token t, u;
+  int level;
+  int repeat;
+  gfc_try rv;
+
+  use_last_char = 0;
+  saved_token = FMT_NONE;
+  level = 0;
+  repeat = 0;
+  rv = SUCCESS;
+  format_string_pos = 0;
+
+  t = format_lex ();
+  if (t == FMT_ERROR)
+    goto fail;
+  if (t != FMT_LPAREN)
+    {
+      error = _("Missing leading left parenthesis");
+      goto syntax;
+    }
+
+  t = format_lex ();
+  if (t == FMT_ERROR)
+    goto fail;
+  if (t == FMT_RPAREN)
+    goto finished;		/* Empty format is legal */
+  saved_token = t;
+
+format_item:
+  /* In this state, the next thing has to be a format item.  */
+  t = format_lex ();
+  if (t == FMT_ERROR)
+    goto fail;
+format_item_1:
+  switch (t)
+    {
+    case FMT_STAR:
+      repeat = -1;
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t == FMT_LPAREN)
+	{
+	  level++;
+	  goto format_item;
+	}
+      error = _("Left parenthesis required after '*'");
+      goto syntax;
+
+    case FMT_POSINT:
+      repeat = value;
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t == FMT_LPAREN)
+	{
+	  level++;
+	  goto format_item;
+	}
+
+      if (t == FMT_SLASH)
+	goto optional_comma;
+
+      goto data_desc;
+
+    case FMT_LPAREN:
+      level++;
+      goto format_item;
+
+    case FMT_SIGNED_INT:
+    case FMT_ZERO:
+      /* Signed integer can only precede a P format.  */
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t != FMT_P)
+	{
+	  error = _("Expected P edit descriptor");
+	  goto syntax;
+	}
+
+      goto data_desc;
+
+    case FMT_P:
+      /* P requires a prior number.  */
+      error = _("P descriptor requires leading scale factor");
+      goto syntax;
+
+    case FMT_X:
+      /* X requires a prior number if we're being pedantic.  */
+      if (mode != MODE_FORMAT)
+	format_locus.nextc += format_string_pos;
+      if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
+			  "requires leading space count at %L", &format_locus)
+	  == FAILURE)
+	return FAILURE;
+      goto between_desc;
+
+    case FMT_SIGN:
+    case FMT_BLANK:
+    case FMT_DP:
+    case FMT_DC:
+    case FMT_RC:
+    case FMT_RD:
+    case FMT_RN:
+    case FMT_RP:
+    case FMT_RU:
+    case FMT_RZ:
+      goto between_desc;
+
+    case FMT_CHAR:
+      goto extension_optional_comma;
+
+    case FMT_COLON:
+    case FMT_SLASH:
+      goto optional_comma;
+
+    case FMT_DOLLAR:
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+
+      if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %L",
+	  &format_locus) == FAILURE)
+	return FAILURE;
+      if (t != FMT_RPAREN || level > 0)
+	{
+	  gfc_warning ("$ should be the last specifier in format at %L",
+		       &format_locus);
+	  goto optional_comma_1;
+	}
+
+      goto finished;
+
+    case FMT_T:
+    case FMT_TL:
+    case FMT_TR:
+    case FMT_IBOZ:
+    case FMT_F:
+    case FMT_E:
+    case FMT_EN:
+    case FMT_ES:
+    case FMT_G:
+    case FMT_L:
+    case FMT_A:
+    case FMT_D:
+    case FMT_H:
+      goto data_desc;
+
+    case FMT_END:
+      error = unexpected_end;
+      goto syntax;
+
+    default:
+      error = unexpected_element;
+      goto syntax;
+    }
+
+data_desc:
+  /* In this state, t must currently be a data descriptor.
+     Deal with things that can/must follow the descriptor.  */
+  switch (t)
+    {
+    case FMT_SIGN:
+    case FMT_BLANK:
+    case FMT_DP:
+    case FMT_DC:
+    case FMT_X:
+      break;
+
+    case FMT_P:
+      /* No comma after P allowed only for F, E, EN, ES, D, or G.
+	 10.1.1 (1).  */
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (!(gfc_option.allow_std & GFC_STD_F2003) && t != FMT_COMMA
+	  && t != FMT_F && t != FMT_E && t != FMT_EN && t != FMT_ES
+	  && t != FMT_D && t != FMT_G && t != FMT_RPAREN && t != FMT_SLASH)
+	{
+	  error = _("Comma required after P descriptor");
+	  goto syntax;
+	}
+      if (t != FMT_COMMA)
+	{
+	  if (t == FMT_POSINT)
+	    {
+	      t = format_lex ();
+	      if (t == FMT_ERROR)
+		goto fail;
+	    }
+          if (t != FMT_F && t != FMT_E && t != FMT_EN && t != FMT_ES && t != FMT_D
+	      && t != FMT_G && t != FMT_RPAREN && t != FMT_SLASH)
+	    {
+	      error = _("Comma required after P descriptor");
+	      goto syntax;
+	    }
+	}
+
+      saved_token = t;
+      goto optional_comma;
+
+    case FMT_T:
+    case FMT_TL:
+    case FMT_TR:
+      t = format_lex ();
+      if (t != FMT_POSINT)
+	{
+	  error = _("Positive width required with T descriptor");
+	  goto syntax;
+	}
+      break;
+
+    case FMT_L:
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t == FMT_POSINT)
+	break;
+
+      switch (gfc_notification_std (GFC_STD_GNU))
+	{
+	  case WARNING:
+	    if (mode != MODE_FORMAT)
+	      format_locus.nextc += format_string_pos;
+	    gfc_warning ("Extension: Missing positive width after L "
+			 "descriptor at %L", &format_locus);
+	    saved_token = t;
+	    break;
+
+	  case ERROR:
+	    error = posint_required;
+	    goto syntax;
+
+	  case SILENT:
+	    saved_token = t;
+	    break;
+
+	  default:
+	    gcc_unreachable ();
+	}
+      break;
+
+    case FMT_A:
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t == FMT_ZERO)
+	{
+	  error = zero_width;
+	  goto syntax;
+	}
+      if (t != FMT_POSINT)
+	saved_token = t;
+      break;
+
+    case FMT_D:
+    case FMT_E:
+    case FMT_G:
+    case FMT_EN:
+    case FMT_ES:
+      u = format_lex ();
+      if (t == FMT_G && u == FMT_ZERO)
+	{
+	  if (is_input)
+	    {
+	      error = zero_width;
+	      goto syntax;
+	    }
+	  if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: 'G0' in "
+			      "format at %L", &format_locus) == FAILURE)
+	    return FAILURE;
+	  u = format_lex ();
+	  if (u != FMT_PERIOD)
+	    {
+	      saved_token = u;
+	      break;
+	    }
+	  u = format_lex ();
+	  if (u != FMT_POSINT)
+	    {
+	      error = posint_required;
+	      goto syntax;
+	    }
+	  u = format_lex ();
+	  if (u == FMT_E)
+	    {
+	      error = _("E specifier not allowed with g0 descriptor");
+	      goto syntax;
+	    }
+	  saved_token = u;
+	  break;
+	}
+
+      if (u != FMT_POSINT)
+	{
+	  format_locus.nextc += format_string_pos;
+	  gfc_error ("Positive width required in format "
+			 "specifier %s at %L", token_to_string (t),
+			 &format_locus);
+	  saved_token = u;
+	  goto fail;
+	}
+
+      u = format_lex ();
+      if (u == FMT_ERROR)
+	goto fail;
+      if (u != FMT_PERIOD)
+	{
+	  /* Warn if -std=legacy, otherwise error.  */
+	  format_locus.nextc += format_string_pos;
+	  if (gfc_option.warn_std != 0)
+	    {
+	      gfc_error ("Period required in format "
+			     "specifier %s at %L", token_to_string (t),
+			     &format_locus);
+	      saved_token = u;
+              goto fail;
+	    }
+	  else
+	    gfc_warning ("Period required in format "
+			 "specifier %s at %L", token_to_string (t),
+			  &format_locus);
+	  /* If we go to finished, we need to unwind this
+	     before the next round.  */
+	  format_locus.nextc -= format_string_pos;
+	  saved_token = u;
+	  break;
+	}
+
+      u = format_lex ();
+      if (u == FMT_ERROR)
+	goto fail;
+      if (u != FMT_ZERO && u != FMT_POSINT)
+	{
+	  error = nonneg_required;
+	  goto syntax;
+	}
+
+      if (t == FMT_D)
+	break;
+
+      /* Look for optional exponent.  */
+      u = format_lex ();
+      if (u == FMT_ERROR)
+	goto fail;
+      if (u != FMT_E)
+	{
+	  saved_token = u;
+	}
+      else
+	{
+	  u = format_lex ();
+	  if (u == FMT_ERROR)
+	    goto fail;
+	  if (u != FMT_POSINT)
+	    {
+	      error = _("Positive exponent width required");
+	      goto syntax;
+	    }
+	}
+
+      break;
+
+    case FMT_F:
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t != FMT_ZERO && t != FMT_POSINT)
+	{
+	  error = nonneg_required;
+	  goto syntax;
+	}
+      else if (is_input && t == FMT_ZERO)
+	{
+	  error = posint_required;
+	  goto syntax;
+	}
+
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t != FMT_PERIOD)
+	{
+	  /* Warn if -std=legacy, otherwise error.  */
+	  if (gfc_option.warn_std != 0)
+	    {
+	      error = _("Period required in format specifier");
+	      goto syntax;
+	    }
+	  if (mode != MODE_FORMAT)
+	    format_locus.nextc += format_string_pos;
+	  gfc_warning ("Period required in format specifier at %L",
+		       &format_locus);
+	  saved_token = t;
+	  break;
+	}
+
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t != FMT_ZERO && t != FMT_POSINT)
+	{
+	  error = nonneg_required;
+	  goto syntax;
+	}
+
+      break;
+
+    case FMT_H:
+      if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
+	{
+	  if (mode != MODE_FORMAT)
+	    format_locus.nextc += format_string_pos;
+	  gfc_warning ("The H format specifier at %L is"
+		       " a Fortran 95 deleted feature", &format_locus);
+	}
+      if (mode == MODE_STRING)
+	{
+	  format_string += value;
+	  format_length -= value;
+          format_string_pos += repeat;
+	}
+      else
+	{
+	  while (repeat >0)
+	   {
+	     next_char (INSTRING_WARN);
+	     repeat -- ;
+	   }
+	}
+     break;
+
+    case FMT_IBOZ:
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t != FMT_ZERO && t != FMT_POSINT)
+	{
+	  error = nonneg_required;
+	  goto syntax;
+	}
+      else if (is_input && t == FMT_ZERO)
+	{
+	  error = posint_required;
+	  goto syntax;
+	}
+
+      t = format_lex ();
+      if (t == FMT_ERROR)
+	goto fail;
+      if (t != FMT_PERIOD)
+	{
+	  saved_token = t;
+	}
+      else
+	{
+	  t = format_lex ();
+	  if (t == FMT_ERROR)
+	    goto fail;
+	  if (t != FMT_ZERO && t != FMT_POSINT)
+	    {
+	      error = nonneg_required;
+	      goto syntax;
+	    }
+	}
+
+      break;
+
+    default:
+      error = unexpected_element;
+      goto syntax;
+    }
+
+between_desc:
+  /* Between a descriptor and what comes next.  */
+  t = format_lex ();
+  if (t == FMT_ERROR)
+    goto fail;
+  switch (t)
+    {
+
+    case FMT_COMMA:
+      goto format_item;
+
+    case FMT_RPAREN:
+      level--;
+      if (level < 0)
+	goto finished;
+      goto between_desc;
+
+    case FMT_COLON:
+    case FMT_SLASH:
+      goto optional_comma;
+
+    case FMT_END:
+      error = unexpected_end;
+      goto syntax;
+
+    default:
+      if (mode != MODE_FORMAT)
+	format_locus.nextc += format_string_pos - 1;
+      if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %L",
+	  &format_locus) == FAILURE)
+	return FAILURE;
+      /* If we do not actually return a failure, we need to unwind this
+         before the next round.  */
+      if (mode != MODE_FORMAT)
+	format_locus.nextc -= format_string_pos;
+      goto format_item_1;
+    }
+
+optional_comma:
+  /* Optional comma is a weird between state where we've just finished
+     reading a colon, slash, dollar or P descriptor.  */
+  t = format_lex ();
+  if (t == FMT_ERROR)
+    goto fail;
+optional_comma_1:
+  switch (t)
+    {
+    case FMT_COMMA:
+      break;
+
+    case FMT_RPAREN:
+      level--;
+      if (level < 0)
+	goto finished;
+      goto between_desc;
+
+    default:
+      /* Assume that we have another format item.  */
+      saved_token = t;
+      break;
+    }
+
+  goto format_item;
+
+extension_optional_comma:
+  /* As a GNU extension, permit a missing comma after a string literal.  */
+  t = format_lex ();
+  if (t == FMT_ERROR)
+    goto fail;
+  switch (t)
+    {
+    case FMT_COMMA:
+      break;
+
+    case FMT_RPAREN:
+      level--;
+      if (level < 0)
+	goto finished;
+      goto between_desc;
+
+    case FMT_COLON:
+    case FMT_SLASH:
+      goto optional_comma;
+
+    case FMT_END:
+      error = unexpected_end;
+      goto syntax;
+
+    default:
+      if (mode != MODE_FORMAT)
+	format_locus.nextc += format_string_pos;
+      if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %L",
+	  &format_locus) == FAILURE)
+	return FAILURE;
+      /* If we do not actually return a failure, we need to unwind this
+         before the next round.  */
+      if (mode != MODE_FORMAT)
+	format_locus.nextc -= format_string_pos;
+      saved_token = t;
+      break;
+    }
+
+  goto format_item;
+  
+syntax:
+  if (mode != MODE_FORMAT)
+    format_locus.nextc += format_string_pos;
+  if (error == unexpected_element)
+    gfc_error (error, error_element, &format_locus);
+  else
+    gfc_error ("%s in format string at %L", error, &format_locus);
+fail:
+  rv = FAILURE;
+
+finished:
+  return rv;
+}
+
+
+/* Given an expression node that is a constant string, see if it looks
+   like a format string.  */
+
+static gfc_try
+check_format_string (gfc_expr *e, bool is_input)
+{
+  gfc_try rv;
+  int i;
+  if (!e || e->ts.type != BT_CHARACTER || e->expr_type != EXPR_CONSTANT)
+    return SUCCESS;
+
+  mode = MODE_STRING;
+  format_string = e->value.character.string;
+
+  /* More elaborate measures are needed to show where a problem is within a
+     format string that has been calculated, but that's probably not worth the
+     effort.  */
+  format_locus = e->where;
+  rv = check_format (is_input);
+  /* check for extraneous characters at the end of an otherwise valid format
+     string, like '(A10,I3)F5'
+     start at the end and move back to the last character processed,
+     spaces are OK */
+  if (rv == SUCCESS && e->value.character.length > format_string_pos)
+    for (i=e->value.character.length-1;i>format_string_pos-1;i--)
+      if (e->value.character.string[i] != ' ')
+        {
+          format_locus.nextc += format_length + 1; 
+          gfc_warning ("Extraneous characters in format at %L", &format_locus); 
+          break;
+        }
+  return rv;
+}
+
+
+/************ Fortran 95 I/O statement matchers *************/
+
+/* Match a FORMAT statement.  This amounts to actually parsing the
+   format descriptors in order to correctly locate the end of the
+   format string.  */
+
+match
+gfc_match_format (void)
+{
+  gfc_expr *e;
+  locus start;
+
+  if (gfc_current_ns->proc_name
+      && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
+    {
+      gfc_error ("Format statement in module main block at %C");
+      return MATCH_ERROR;
+    }
+
+  if (gfc_statement_label == NULL)
+    {
+      gfc_error ("Missing format label at %C");
+      return MATCH_ERROR;
+    }
+  gfc_gobble_whitespace ();
+
+  mode = MODE_FORMAT;
+  format_length = 0;
+
+  start = gfc_current_locus;
+
+  if (check_format (false) == FAILURE)
+    return MATCH_ERROR;
+
+  if (gfc_match_eos () != MATCH_YES)
+    {
+      gfc_syntax_error (ST_FORMAT);
+      return MATCH_ERROR;
+    }
+
+  /* The label doesn't get created until after the statement is done
+     being matched, so we have to leave the string for later.  */
+
+  gfc_current_locus = start;	/* Back to the beginning */
+
+  new_st.loc = start;
+  new_st.op = EXEC_NOP;
+
+  e = gfc_get_character_expr (gfc_default_character_kind, &start,
+			      NULL, format_length);
+  format_string = e->value.character.string;
+  gfc_statement_label->format = e;
+
+  mode = MODE_COPY;
+  check_format (false);		/* Guaranteed to succeed */
+  gfc_match_eos ();		/* Guaranteed to succeed */
+
+  return MATCH_YES;
+}
+
+
+/* Match an expression I/O tag of some sort.  */
+
+static match
+match_etag (const io_tag *tag, gfc_expr **v)
+{
+  gfc_expr *result;
+  match m;
+
+  m = gfc_match (tag->spec);
+  if (m != MATCH_YES)
+    return m;
+
+  m = gfc_match (tag->value, &result);
+  if (m != MATCH_YES)
+    {
+      gfc_error ("Invalid value for %s specification at %C", tag->name);
+      return MATCH_ERROR;
+    }
+
+  if (*v != NULL)
+    {
+      gfc_error ("Duplicate %s specification at %C", tag->name);
+      gfc_free_expr (result);
+      return MATCH_ERROR;
+    }
+
+  *v = result;
+  return MATCH_YES;
+}
+
+
+/* Match a variable I/O tag of some sort.  */
+
+static match
+match_vtag (const io_tag *tag, gfc_expr **v)
+{
+  gfc_expr *result;
+  match m;
+
+  m = gfc_match (tag->spec);
+  if (m != MATCH_YES)
+    return m;
+
+  m = gfc_match (tag->value, &result);
+  if (m != MATCH_YES)
+    {
+      gfc_error ("Invalid value for %s specification at %C", tag->name);
+      return MATCH_ERROR;
+    }
+
+  if (*v != NULL)
+    {
+      gfc_error ("Duplicate %s specification at %C", tag->name);
+      gfc_free_expr (result);
+      return MATCH_ERROR;
+    }
+
+  if (result->symtree->n.sym->attr.intent == INTENT_IN)
+    {
+      gfc_error ("Variable %s cannot be INTENT(IN) at %C", tag->name);
+      gfc_free_expr (result);
+      return MATCH_ERROR;
+    }
+
+  if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
+    {
+      gfc_error ("Variable %s cannot be assigned in PURE procedure at %C",
+		 tag->name);
+      gfc_free_expr (result);
+      return MATCH_ERROR;
+    }
+
+  if (gfc_implicit_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
+    gfc_current_ns->proc_name->attr.implicit_pure = 0;
+
+  *v = result;
+  return MATCH_YES;
+}
+
+
+/* Match I/O tags that cause variables to become redefined.  */
+
+static match
+match_out_tag (const io_tag *tag, gfc_expr **result)
+{
+  match m;
+
+  m = match_vtag (tag, result);
+  if (m == MATCH_YES)
+    gfc_check_do_variable ((*result)->symtree);
+
+  return m;
+}
+
+
+/* Match a label I/O tag.  */
+
+static match
+match_ltag (const io_tag *tag, gfc_st_label ** label)
+{
+  match m;
+  gfc_st_label *old;
+
+  old = *label;
+  m = gfc_match (tag->spec);
+  if (m != MATCH_YES)
+    return m;
+
+  m = gfc_match (tag->value, label);
+  if (m != MATCH_YES)
+    {
+      gfc_error ("Invalid value for %s specification at %C", tag->name);
+      return MATCH_ERROR;
+    }
+
+  if (old)
+    {
+      gfc_error ("Duplicate %s label specification at %C", tag->name);
+      return MATCH_ERROR;
+    }
+
+  if (gfc_reference_st_label (*label, ST_LABEL_TARGET) == FAILURE)
+    return MATCH_ERROR;
+
+  return m;
+}
+
+
+/* Resolution of the FORMAT tag, to be called from resolve_tag.  */
+
+static gfc_try
+resolve_tag_format (const gfc_expr *e)
+{
+  if (e->expr_type == EXPR_CONSTANT
+      && (e->ts.type != BT_CHARACTER
+	  || e->ts.kind != gfc_default_character_kind))
+    {
+      gfc_error ("Constant expression in FORMAT tag at %L must be "
+		 "of type default CHARACTER", &e->where);
+      return FAILURE;
+    }
+
+  /* If e's rank is zero and e is not an element of an array, it should be
+     of integer or character type.  The integer variable should be
+     ASSIGNED.  */
+  if (e->rank == 0
+      && (e->expr_type != EXPR_VARIABLE
+	  || e->symtree == NULL
+	  || e->symtree->n.sym->as == NULL
+	  || e->symtree->n.sym->as->rank == 0))
+    {
+      if (e->ts.type != BT_CHARACTER && e->ts.type != BT_INTEGER)
+	{
+	  gfc_error ("FORMAT tag at %L must be of type CHARACTER or INTEGER",
+		     &e->where);
+	  return FAILURE;
+	}
+      else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
+	{
+	  if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGNED "
+			      "variable in FORMAT tag at %L", &e->where)
+	      == FAILURE)
+	    return FAILURE;
+	  if (e->symtree->n.sym->attr.assign != 1)
+	    {
+	      gfc_error ("Variable '%s' at %L has not been assigned a "
+			 "format label", e->symtree->n.sym->name, &e->where);
+	      return FAILURE;
+	    }
+	}
+      else if (e->ts.type == BT_INTEGER)
+	{
+	  gfc_error ("Scalar '%s' in FORMAT tag at %L is not an ASSIGNED "
+		     "variable", gfc_basic_typename (e->ts.type), &e->where);
+	  return FAILURE;
+	}
+
+      return SUCCESS;
+    }
+
+  /* If rank is nonzero and type is not character, we allow it under GFC_STD_LEGACY.
+     It may be assigned an Hollerith constant.  */
+  if (e->ts.type != BT_CHARACTER)
+    {
+      if (gfc_notify_std (GFC_STD_LEGACY, "Extension: Non-character "
+			  "in FORMAT tag at %L", &e->where) == FAILURE)
+	return FAILURE;
+
+      if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SHAPE)
+	{
+	  gfc_error ("Non-character assumed shape array element in FORMAT"
+		     " tag at %L", &e->where);
+	  return FAILURE;
+	}
+
+      if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SIZE)
+	{
+	  gfc_error ("Non-character assumed size array element in FORMAT"
+		     " tag at %L", &e->where);
+	  return FAILURE;
+	}
+
+      if (e->rank == 0 && e->symtree->n.sym->attr.pointer)
+	{
+	  gfc_error ("Non-character pointer array element in FORMAT tag at %L",
+		     &e->where);
+	  return FAILURE;
+	}
+    }
+
+  return SUCCESS;
+}
+
+
+/* Do expression resolution and type-checking on an expression tag.  */
+
+static gfc_try
+resolve_tag (const io_tag *tag, gfc_expr *e)
+{
+  if (e == NULL)
+    return SUCCESS;
+
+  if (gfc_resolve_expr (e) == FAILURE)
+    return FAILURE;
+
+  if (tag == &tag_format)
+    return resolve_tag_format (e);
+
+  if (e->ts.type != tag->type)
+    {
+      gfc_error ("%s tag at %L must be of type %s", tag->name,
+		 &e->where, gfc_basic_typename (tag->type));
+      return FAILURE;
+    }
+
+  if (e->rank != 0)
+    {
+      gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
+      return FAILURE;
+    }
+
+  if (tag == &tag_iomsg)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
+			  &e->where) == FAILURE)
+	return FAILURE;
+    }
+
+  if ((tag == &tag_iostat || tag == &tag_size || tag == &tag_iolength)
+      && e->ts.kind != gfc_default_integer_kind)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 95 requires default "
+			  "INTEGER in %s tag at %L", tag->name, &e->where)
+	  == FAILURE)
+	return FAILURE;
+    }
+
+  if (tag == &tag_exist && e->ts.kind != gfc_default_logical_kind)
+    {
+      if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Nondefault LOGICAL "
+			  "in %s tag at %L", tag->name, &e->where)
+	  == FAILURE)
+	return FAILURE;
+    }
+
+  if (tag == &tag_newunit)
+    {
+      if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: NEWUNIT specifier"
+			  " at %L", &e->where) == FAILURE)
+	return FAILURE;
+    }
+
+  /* NEWUNIT, IOSTAT, SIZE and IOMSG are variable definition contexts.  */
+  if (tag == &tag_newunit || tag == &tag_iostat
+      || tag == &tag_size || tag == &tag_iomsg)
+    {
+      char context[64];
+
+      sprintf (context, _("%s tag"), tag->name);
+      if (gfc_check_vardef_context (e, false, context) == FAILURE)
+	return FAILURE;
+    }
+  
+  if (tag == &tag_convert)
+    {
+      if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
+			  &e->where) == FAILURE)
+	return FAILURE;
+    }
+
+  return SUCCESS;
+}
+
+
+/* Match a single tag of an OPEN statement.  */
+
+static match
+match_open_element (gfc_open *open)
+{
+  match m;
+
+  m = match_etag (&tag_e_async, &open->asynchronous);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_unit, &open->unit);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_iomsg, &open->iomsg);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_iostat, &open->iostat);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_file, &open->file);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_status, &open->status);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_access, &open->access);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_form, &open->form);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_recl, &open->recl);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_blank, &open->blank);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_position, &open->position);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_action, &open->action);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_delim, &open->delim);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_pad, &open->pad);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_decimal, &open->decimal);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_encoding, &open->encoding);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_round, &open->round);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_sign, &open->sign);
+  if (m != MATCH_NO)
+    return m;
+  m = match_ltag (&tag_err, &open->err);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_convert, &open->convert);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_newunit, &open->newunit);
+  if (m != MATCH_NO)
+    return m;
+
+  return MATCH_NO;
+}
+
+
+/* Free the gfc_open structure and all the expressions it contains.  */
+
+void
+gfc_free_open (gfc_open *open)
+{
+  if (open == NULL)
+    return;
+
+  gfc_free_expr (open->unit);
+  gfc_free_expr (open->iomsg);
+  gfc_free_expr (open->iostat);
+  gfc_free_expr (open->file);
+  gfc_free_expr (open->status);
+  gfc_free_expr (open->access);
+  gfc_free_expr (open->form);
+  gfc_free_expr (open->recl);
+  gfc_free_expr (open->blank);
+  gfc_free_expr (open->position);
+  gfc_free_expr (open->action);
+  gfc_free_expr (open->delim);
+  gfc_free_expr (open->pad);
+  gfc_free_expr (open->decimal);
+  gfc_free_expr (open->encoding);
+  gfc_free_expr (open->round);
+  gfc_free_expr (open->sign);
+  gfc_free_expr (open->convert);
+  gfc_free_expr (open->asynchronous);
+  gfc_free_expr (open->newunit);
+  gfc_free (open);
+}
+
+
+/* Resolve everything in a gfc_open structure.  */
+
+gfc_try
+gfc_resolve_open (gfc_open *open)
+{
+
+  RESOLVE_TAG (&tag_unit, open->unit);
+  RESOLVE_TAG (&tag_iomsg, open->iomsg);
+  RESOLVE_TAG (&tag_iostat, open->iostat);
+  RESOLVE_TAG (&tag_file, open->file);
+  RESOLVE_TAG (&tag_status, open->status);
+  RESOLVE_TAG (&tag_e_access, open->access);
+  RESOLVE_TAG (&tag_e_form, open->form);
+  RESOLVE_TAG (&tag_e_recl, open->recl);
+  RESOLVE_TAG (&tag_e_blank, open->blank);
+  RESOLVE_TAG (&tag_e_position, open->position);
+  RESOLVE_TAG (&tag_e_action, open->action);
+  RESOLVE_TAG (&tag_e_delim, open->delim);
+  RESOLVE_TAG (&tag_e_pad, open->pad);
+  RESOLVE_TAG (&tag_e_decimal, open->decimal);
+  RESOLVE_TAG (&tag_e_encoding, open->encoding);
+  RESOLVE_TAG (&tag_e_async, open->asynchronous);
+  RESOLVE_TAG (&tag_e_round, open->round);
+  RESOLVE_TAG (&tag_e_sign, open->sign);
+  RESOLVE_TAG (&tag_convert, open->convert);
+  RESOLVE_TAG (&tag_newunit, open->newunit);
+
+  if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
+    return FAILURE;
+
+  return SUCCESS;
+}
+
+
+/* Check if a given value for a SPECIFIER is either in the list of values
+   allowed in F95 or F2003, issuing an error message and returning a zero
+   value if it is not allowed.  */
+
+static int
+compare_to_allowed_values (const char *specifier, const char *allowed[],
+			   const char *allowed_f2003[], 
+			   const char *allowed_gnu[], gfc_char_t *value,
+			   const char *statement, bool warn)
+{
+  int i;
+  unsigned int len;
+
+  len = gfc_wide_strlen (value);
+  if (len > 0)
+  {
+    for (len--; len > 0; len--)
+      if (value[len] != ' ')
+	break;
+    len++;
+  }
+
+  for (i = 0; allowed[i]; i++)
+    if (len == strlen (allowed[i])
+	&& gfc_wide_strncasecmp (value, allowed[i], strlen (allowed[i])) == 0)
+      return 1;
+
+  for (i = 0; allowed_f2003 && allowed_f2003[i]; i++)
+    if (len == strlen (allowed_f2003[i])
+	&& gfc_wide_strncasecmp (value, allowed_f2003[i],
+				 strlen (allowed_f2003[i])) == 0)
+      {
+	notification n = gfc_notification_std (GFC_STD_F2003);
+
+	if (n == WARNING || (warn && n == ERROR))
+	  {
+	    gfc_warning ("Fortran 2003: %s specifier in %s statement at %C "
+			 "has value '%s'", specifier, statement,
+			 allowed_f2003[i]);
+	    return 1;
+	  }
+	else
+	  if (n == ERROR)
+	    {
+	      gfc_notify_std (GFC_STD_F2003, "Fortran 2003: %s specifier in "
+			      "%s statement at %C has value '%s'", specifier,
+			      statement, allowed_f2003[i]);
+	      return 0;
+	    }
+
+	/* n == SILENT */
+	return 1;
+      }
+
+  for (i = 0; allowed_gnu && allowed_gnu[i]; i++)
+    if (len == strlen (allowed_gnu[i])
+	&& gfc_wide_strncasecmp (value, allowed_gnu[i],
+				 strlen (allowed_gnu[i])) == 0)
+      {
+	notification n = gfc_notification_std (GFC_STD_GNU);
+
+	if (n == WARNING || (warn && n == ERROR))
+	  {
+	    gfc_warning ("Extension: %s specifier in %s statement at %C "
+			 "has value '%s'", specifier, statement,
+			 allowed_gnu[i]);
+	    return 1;
+	  }
+	else
+	  if (n == ERROR)
+	    {
+	      gfc_notify_std (GFC_STD_GNU, "Extension: %s specifier in "
+			      "%s statement at %C has value '%s'", specifier,
+			      statement, allowed_gnu[i]);
+	      return 0;
+	    }
+
+	/* n == SILENT */
+	return 1;
+      }
+
+  if (warn)
+    {
+      char *s = gfc_widechar_to_char (value, -1);
+      gfc_warning ("%s specifier in %s statement at %C has invalid value '%s'",
+		   specifier, statement, s);
+      gfc_free (s);
+      return 1;
+    }
+  else
+    {
+      char *s = gfc_widechar_to_char (value, -1);
+      gfc_error ("%s specifier in %s statement at %C has invalid value '%s'",
+		 specifier, statement, s);
+      gfc_free (s);
+      return 0;
+    }
+}
+
+
+/* Match an OPEN statement.  */
+
+match
+gfc_match_open (void)
+{
+  gfc_open *open;
+  match m;
+  bool warn;
+
+  m = gfc_match_char ('(');
+  if (m == MATCH_NO)
+    return m;
+
+  open = XCNEW (gfc_open);
+
+  m = match_open_element (open);
+
+  if (m == MATCH_ERROR)
+    goto cleanup;
+  if (m == MATCH_NO)
+    {
+      m = gfc_match_expr (&open->unit);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+    }
+
+  for (;;)
+    {
+      if (gfc_match_char (')') == MATCH_YES)
+	break;
+      if (gfc_match_char (',') != MATCH_YES)
+	goto syntax;
+
+      m = match_open_element (open);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+    }
+
+  if (gfc_match_eos () == MATCH_NO)
+    goto syntax;
+
+  if (gfc_pure (NULL))
+    {
+      gfc_error ("OPEN statement not allowed in PURE procedure at %C");
+      goto cleanup;
+    }
+
+  if (gfc_implicit_pure (NULL))
+    gfc_current_ns->proc_name->attr.implicit_pure = 0;
+
+  warn = (open->err || open->iostat) ? true : false;
+
+  /* Checks on NEWUNIT specifier.  */
+  if (open->newunit)
+    {
+      if (open->unit)
+	{
+	  gfc_error ("UNIT specifier not allowed with NEWUNIT at %C");
+	  goto cleanup;
+	}
+
+      if (!(open->file || (open->status
+          && gfc_wide_strncasecmp (open->status->value.character.string,
+				   "scratch", 7) == 0)))
+	{
+	  gfc_error ("NEWUNIT specifier must have FILE= "
+		     "or STATUS='scratch' at %C");
+	  goto cleanup;
+	}
+    }
+  else if (!open->unit)
+    {
+      gfc_error ("OPEN statement at %C must have UNIT or NEWUNIT specified");
+      goto cleanup;
+    }
+
+  /* Checks on the ACCESS specifier.  */
+  if (open->access && open->access->expr_type == EXPR_CONSTANT)
+    {
+      static const char *access_f95[] = { "SEQUENTIAL", "DIRECT", NULL };
+      static const char *access_f2003[] = { "STREAM", NULL };
+      static const char *access_gnu[] = { "APPEND", NULL };
+
+      if (!compare_to_allowed_values ("ACCESS", access_f95, access_f2003,
+				      access_gnu,
+				      open->access->value.character.string,
+				      "OPEN", warn))
+	goto cleanup;
+    }
+
+  /* Checks on the ACTION specifier.  */
+  if (open->action && open->action->expr_type == EXPR_CONSTANT)
+    {
+      static const char *action[] = { "READ", "WRITE", "READWRITE", NULL };
+
+      if (!compare_to_allowed_values ("ACTION", action, NULL, NULL,
+				      open->action->value.character.string,
+				      "OPEN", warn))
+	goto cleanup;
+    }
+
+  /* Checks on the ASYNCHRONOUS specifier.  */
+  if (open->asynchronous)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ASYNCHRONOUS= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	goto cleanup;
+
+      if (open->asynchronous->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * asynchronous[] = { "YES", "NO", NULL };
+
+	  if (!compare_to_allowed_values ("ASYNCHRONOUS", asynchronous,
+			NULL, NULL, open->asynchronous->value.character.string,
+			"OPEN", warn))
+	    goto cleanup;
+	}
+    }
+
+  /* Checks on the BLANK specifier.  */
+  if (open->blank)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BLANK= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	goto cleanup;
+
+      if (open->blank->expr_type == EXPR_CONSTANT)
+	{
+	  static const char *blank[] = { "ZERO", "NULL", NULL };
+
+	  if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
+					  open->blank->value.character.string,
+					  "OPEN", warn))
+	    goto cleanup;
+	}
+    }
+
+  /* Checks on the DECIMAL specifier.  */
+  if (open->decimal)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DECIMAL= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	goto cleanup;
+
+      if (open->decimal->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * decimal[] = { "COMMA", "POINT", NULL };
+
+	  if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
+					  open->decimal->value.character.string,
+					  "OPEN", warn))
+	    goto cleanup;
+	}
+    }
+
+  /* Checks on the DELIM specifier.  */
+  if (open->delim)
+    {
+      if (open->delim->expr_type == EXPR_CONSTANT)
+	{
+	  static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
+
+	  if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
+					  open->delim->value.character.string,
+					  "OPEN", warn))
+	  goto cleanup;
+	}
+    }
+
+  /* Checks on the ENCODING specifier.  */
+  if (open->encoding)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ENCODING= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	goto cleanup;
+    
+      if (open->encoding->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * encoding[] = { "DEFAULT", "UTF-8", NULL };
+
+	  if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL,
+					  open->encoding->value.character.string,
+					  "OPEN", warn))
+	  goto cleanup;
+	}
+    }
+
+  /* Checks on the FORM specifier.  */
+  if (open->form && open->form->expr_type == EXPR_CONSTANT)
+    {
+      static const char *form[] = { "FORMATTED", "UNFORMATTED", NULL };
+
+      if (!compare_to_allowed_values ("FORM", form, NULL, NULL,
+				      open->form->value.character.string,
+				      "OPEN", warn))
+	goto cleanup;
+    }
+
+  /* Checks on the PAD specifier.  */
+  if (open->pad && open->pad->expr_type == EXPR_CONSTANT)
+    {
+      static const char *pad[] = { "YES", "NO", NULL };
+
+      if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
+				      open->pad->value.character.string,
+				      "OPEN", warn))
+	goto cleanup;
+    }
+
+  /* Checks on the POSITION specifier.  */
+  if (open->position && open->position->expr_type == EXPR_CONSTANT)
+    {
+      static const char *position[] = { "ASIS", "REWIND", "APPEND", NULL };
+
+      if (!compare_to_allowed_values ("POSITION", position, NULL, NULL,
+				      open->position->value.character.string,
+				      "OPEN", warn))
+	goto cleanup;
+    }
+
+  /* Checks on the ROUND specifier.  */
+  if (open->round)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran F2003: ROUND= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+      goto cleanup;
+
+      if (open->round->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
+					  "COMPATIBLE", "PROCESSOR_DEFINED",
+					   NULL };
+
+	  if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
+					  open->round->value.character.string,
+					  "OPEN", warn))
+	  goto cleanup;
+	}
+    }
+
+  /* Checks on the SIGN specifier.  */
+  if (open->sign) 
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SIGN= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	goto cleanup;
+
+      if (open->sign->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
+					  NULL };
+
+	  if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
+					  open->sign->value.character.string,
+					  "OPEN", warn))
+	  goto cleanup;
+	}
+    }
+
+#define warn_or_error(...) \
+{ \
+  if (warn) \
+    gfc_warning (__VA_ARGS__); \
+  else \
+    { \
+      gfc_error (__VA_ARGS__); \
+      goto cleanup; \
+    } \
+}
+
+  /* Checks on the RECL specifier.  */
+  if (open->recl && open->recl->expr_type == EXPR_CONSTANT
+      && open->recl->ts.type == BT_INTEGER
+      && mpz_sgn (open->recl->value.integer) != 1)
+    {
+      warn_or_error ("RECL in OPEN statement at %C must be positive");
+    }
+
+  /* Checks on the STATUS specifier.  */
+  if (open->status && open->status->expr_type == EXPR_CONSTANT)
+    {
+      static const char *status[] = { "OLD", "NEW", "SCRATCH",
+	"REPLACE", "UNKNOWN", NULL };
+
+      if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
+				      open->status->value.character.string,
+				      "OPEN", warn))
+	goto cleanup;
+
+      /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE,
+	 the FILE= specifier shall appear.  */
+      if (open->file == NULL
+	  && (gfc_wide_strncasecmp (open->status->value.character.string,
+				    "replace", 7) == 0
+	      || gfc_wide_strncasecmp (open->status->value.character.string,
+				       "new", 3) == 0))
+	{
+	  char *s = gfc_widechar_to_char (open->status->value.character.string,
+					  -1);
+	  warn_or_error ("The STATUS specified in OPEN statement at %C is "
+			 "'%s' and no FILE specifier is present", s);
+	  gfc_free (s);
+	}
+
+      /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH,
+	 the FILE= specifier shall not appear.  */
+      if (gfc_wide_strncasecmp (open->status->value.character.string,
+				"scratch", 7) == 0 && open->file)
+	{
+	  warn_or_error ("The STATUS specified in OPEN statement at %C "
+			 "cannot have the value SCRATCH if a FILE specifier "
+			 "is present");
+	}
+    }
+
+  /* Things that are not allowed for unformatted I/O.  */
+  if (open->form && open->form->expr_type == EXPR_CONSTANT
+      && (open->delim || open->decimal || open->encoding || open->round
+	  || open->sign || open->pad || open->blank)
+      && gfc_wide_strncasecmp (open->form->value.character.string,
+			       "unformatted", 11) == 0)
+    {
+      const char *spec = (open->delim ? "DELIM "
+				      : (open->pad ? "PAD " : open->blank
+							    ? "BLANK " : ""));
+
+      warn_or_error ("%s specifier at %C not allowed in OPEN statement for "
+		     "unformatted I/O", spec);
+    }
+
+  if (open->recl && open->access && open->access->expr_type == EXPR_CONSTANT
+      && gfc_wide_strncasecmp (open->access->value.character.string,
+			       "stream", 6) == 0)
+    {
+      warn_or_error ("RECL specifier not allowed in OPEN statement at %C for "
+		     "stream I/O");
+    }
+
+  if (open->position
+      && open->access && open->access->expr_type == EXPR_CONSTANT
+      && !(gfc_wide_strncasecmp (open->access->value.character.string,
+				 "sequential", 10) == 0
+	   || gfc_wide_strncasecmp (open->access->value.character.string,
+				    "stream", 6) == 0
+	   || gfc_wide_strncasecmp (open->access->value.character.string,
+				    "append", 6) == 0))
+    {
+      warn_or_error ("POSITION specifier in OPEN statement at %C only allowed "
+		     "for stream or sequential ACCESS");
+    }
+
+#undef warn_or_error
+
+  new_st.op = EXEC_OPEN;
+  new_st.ext.open = open;
+  return MATCH_YES;
+
+syntax:
+  gfc_syntax_error (ST_OPEN);
+
+cleanup:
+  gfc_free_open (open);
+  return MATCH_ERROR;
+}
+
+
+/* Free a gfc_close structure an all its expressions.  */
+
+void
+gfc_free_close (gfc_close *close)
+{
+  if (close == NULL)
+    return;
+
+  gfc_free_expr (close->unit);
+  gfc_free_expr (close->iomsg);
+  gfc_free_expr (close->iostat);
+  gfc_free_expr (close->status);
+  gfc_free (close);
+}
+
+
+/* Match elements of a CLOSE statement.  */
+
+static match
+match_close_element (gfc_close *close)
+{
+  match m;
+
+  m = match_etag (&tag_unit, &close->unit);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_status, &close->status);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_iomsg, &close->iomsg);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_iostat, &close->iostat);
+  if (m != MATCH_NO)
+    return m;
+  m = match_ltag (&tag_err, &close->err);
+  if (m != MATCH_NO)
+    return m;
+
+  return MATCH_NO;
+}
+
+
+/* Match a CLOSE statement.  */
+
+match
+gfc_match_close (void)
+{
+  gfc_close *close;
+  match m;
+  bool warn;
+
+  m = gfc_match_char ('(');
+  if (m == MATCH_NO)
+    return m;
+
+  close = XCNEW (gfc_close);
+
+  m = match_close_element (close);
+
+  if (m == MATCH_ERROR)
+    goto cleanup;
+  if (m == MATCH_NO)
+    {
+      m = gfc_match_expr (&close->unit);
+      if (m == MATCH_NO)
+	goto syntax;
+      if (m == MATCH_ERROR)
+	goto cleanup;
+    }
+
+  for (;;)
+    {
+      if (gfc_match_char (')') == MATCH_YES)
+	break;
+      if (gfc_match_char (',') != MATCH_YES)
+	goto syntax;
+
+      m = match_close_element (close);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+    }
+
+  if (gfc_match_eos () == MATCH_NO)
+    goto syntax;
+
+  if (gfc_pure (NULL))
+    {
+      gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
+      goto cleanup;
+    }
+
+  if (gfc_implicit_pure (NULL))
+    gfc_current_ns->proc_name->attr.implicit_pure = 0;
+
+  warn = (close->iostat || close->err) ? true : false;
+
+  /* Checks on the STATUS specifier.  */
+  if (close->status && close->status->expr_type == EXPR_CONSTANT)
+    {
+      static const char *status[] = { "KEEP", "DELETE", NULL };
+
+      if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
+				      close->status->value.character.string,
+				      "CLOSE", warn))
+	goto cleanup;
+    }
+
+  new_st.op = EXEC_CLOSE;
+  new_st.ext.close = close;
+  return MATCH_YES;
+
+syntax:
+  gfc_syntax_error (ST_CLOSE);
+
+cleanup:
+  gfc_free_close (close);
+  return MATCH_ERROR;
+}
+
+
+/* Resolve everything in a gfc_close structure.  */
+
+gfc_try
+gfc_resolve_close (gfc_close *close)
+{
+  RESOLVE_TAG (&tag_unit, close->unit);
+  RESOLVE_TAG (&tag_iomsg, close->iomsg);
+  RESOLVE_TAG (&tag_iostat, close->iostat);
+  RESOLVE_TAG (&tag_status, close->status);
+
+  if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
+    return FAILURE;
+
+  if (close->unit->expr_type == EXPR_CONSTANT
+      && close->unit->ts.type == BT_INTEGER
+      && mpz_sgn (close->unit->value.integer) < 0)
+    {
+      gfc_error ("UNIT number in CLOSE statement at %L must be non-negative",
+		 &close->unit->where);
+    }
+
+  return SUCCESS;
+}
+
+
+/* Free a gfc_filepos structure.  */
+
+void
+gfc_free_filepos (gfc_filepos *fp)
+{
+  gfc_free_expr (fp->unit);
+  gfc_free_expr (fp->iomsg);
+  gfc_free_expr (fp->iostat);
+  gfc_free (fp);
+}
+
+
+/* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement.  */
+
+static match
+match_file_element (gfc_filepos *fp)
+{
+  match m;
+
+  m = match_etag (&tag_unit, &fp->unit);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_iomsg, &fp->iomsg);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_iostat, &fp->iostat);
+  if (m != MATCH_NO)
+    return m;
+  m = match_ltag (&tag_err, &fp->err);
+  if (m != MATCH_NO)
+    return m;
+
+  return MATCH_NO;
+}
+
+
+/* Match the second half of the file-positioning statements, REWIND,
+   BACKSPACE, ENDFILE, or the FLUSH statement.  */
+
+static match
+match_filepos (gfc_statement st, gfc_exec_op op)
+{
+  gfc_filepos *fp;
+  match m;
+
+  fp = XCNEW (gfc_filepos);
+
+  if (gfc_match_char ('(') == MATCH_NO)
+    {
+      m = gfc_match_expr (&fp->unit);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+
+      goto done;
+    }
+
+  m = match_file_element (fp);
+  if (m == MATCH_ERROR)
+    goto done;
+  if (m == MATCH_NO)
+    {
+      m = gfc_match_expr (&fp->unit);
+      if (m == MATCH_ERROR)
+	goto done;
+      if (m == MATCH_NO)
+	goto syntax;
+    }
+
+  for (;;)
+    {
+      if (gfc_match_char (')') == MATCH_YES)
+	break;
+      if (gfc_match_char (',') != MATCH_YES)
+	goto syntax;
+
+      m = match_file_element (fp);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+    }
+
+done:
+  if (gfc_match_eos () != MATCH_YES)
+    goto syntax;
+
+  if (gfc_pure (NULL))
+    {
+      gfc_error ("%s statement not allowed in PURE procedure at %C",
+		 gfc_ascii_statement (st));
+
+      goto cleanup;
+    }
+
+  if (gfc_implicit_pure (NULL))
+    gfc_current_ns->proc_name->attr.implicit_pure = 0;
+
+  new_st.op = op;
+  new_st.ext.filepos = fp;
+  return MATCH_YES;
+
+syntax:
+  gfc_syntax_error (st);
+
+cleanup:
+  gfc_free_filepos (fp);
+  return MATCH_ERROR;
+}
+
+
+gfc_try
+gfc_resolve_filepos (gfc_filepos *fp)
+{
+  RESOLVE_TAG (&tag_unit, fp->unit);
+  RESOLVE_TAG (&tag_iostat, fp->iostat);
+  RESOLVE_TAG (&tag_iomsg, fp->iomsg);
+  if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
+    return FAILURE;
+
+  if (fp->unit->expr_type == EXPR_CONSTANT
+      && fp->unit->ts.type == BT_INTEGER
+      && mpz_sgn (fp->unit->value.integer) < 0)
+    {
+      gfc_error ("UNIT number in statement at %L must be non-negative",
+		 &fp->unit->where);
+    }
+
+  return SUCCESS;
+}
+
+
+/* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
+   and the FLUSH statement.  */
+
+match
+gfc_match_endfile (void)
+{
+  return match_filepos (ST_END_FILE, EXEC_ENDFILE);
+}
+
+match
+gfc_match_backspace (void)
+{
+  return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
+}
+
+match
+gfc_match_rewind (void)
+{
+  return match_filepos (ST_REWIND, EXEC_REWIND);
+}
+
+match
+gfc_match_flush (void)
+{
+  if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C")
+      == FAILURE)
+    return MATCH_ERROR;
+
+  return match_filepos (ST_FLUSH, EXEC_FLUSH);
+}
+
+/******************** Data Transfer Statements *********************/
+
+/* Return a default unit number.  */
+
+static gfc_expr *
+default_unit (io_kind k)
+{
+  int unit;
+
+  if (k == M_READ)
+    unit = 5;
+  else
+    unit = 6;
+
+  return gfc_get_int_expr (gfc_default_integer_kind, NULL, unit);
+}
+
+
+/* Match a unit specification for a data transfer statement.  */
+
+static match
+match_dt_unit (io_kind k, gfc_dt *dt)
+{
+  gfc_expr *e;
+
+  if (gfc_match_char ('*') == MATCH_YES)
+    {
+      if (dt->io_unit != NULL)
+	goto conflict;
+
+      dt->io_unit = default_unit (k);
+      return MATCH_YES;
+    }
+
+  if (gfc_match_expr (&e) == MATCH_YES)
+    {
+      if (dt->io_unit != NULL)
+	{
+	  gfc_free_expr (e);
+	  goto conflict;
+	}
+
+      dt->io_unit = e;
+      return MATCH_YES;
+    }
+
+  return MATCH_NO;
+
+conflict:
+  gfc_error ("Duplicate UNIT specification at %C");
+  return MATCH_ERROR;
+}
+
+
+/* Match a format specification.  */
+
+static match
+match_dt_format (gfc_dt *dt)
+{
+  locus where;
+  gfc_expr *e;
+  gfc_st_label *label;
+  match m;
+
+  where = gfc_current_locus;
+
+  if (gfc_match_char ('*') == MATCH_YES)
+    {
+      if (dt->format_expr != NULL || dt->format_label != NULL)
+	goto conflict;
+
+      dt->format_label = &format_asterisk;
+      return MATCH_YES;
+    }
+
+  if ((m = gfc_match_st_label (&label)) == MATCH_YES)
+    {
+      if (dt->format_expr != NULL || dt->format_label != NULL)
+	{
+	  gfc_free_st_label (label);
+	  goto conflict;
+	}
+
+      if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
+	return MATCH_ERROR;
+
+      dt->format_label = label;
+      return MATCH_YES;
+    }
+  else if (m == MATCH_ERROR)
+    /* The label was zero or too large.  Emit the correct diagnosis.  */
+    return MATCH_ERROR;
+
+  if (gfc_match_expr (&e) == MATCH_YES)
+    {
+      if (dt->format_expr != NULL || dt->format_label != NULL)
+	{
+	  gfc_free_expr (e);
+	  goto conflict;
+	}
+      dt->format_expr = e;
+      return MATCH_YES;
+    }
+
+  gfc_current_locus = where;	/* The only case where we have to restore */
+
+  return MATCH_NO;
+
+conflict:
+  gfc_error ("Duplicate format specification at %C");
+  return MATCH_ERROR;
+}
+
+
+/* Traverse a namelist that is part of a READ statement to make sure
+   that none of the variables in the namelist are INTENT(IN).  Returns
+   nonzero if we find such a variable.  */
+
+static int
+check_namelist (gfc_symbol *sym)
+{
+  gfc_namelist *p;
+
+  for (p = sym->namelist; p; p = p->next)
+    if (p->sym->attr.intent == INTENT_IN)
+      {
+	gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
+		   p->sym->name, sym->name);
+	return 1;
+      }
+
+  return 0;
+}
+
+
+/* Match a single data transfer element.  */
+
+static match
+match_dt_element (io_kind k, gfc_dt *dt)
+{
+  char name[GFC_MAX_SYMBOL_LEN + 1];
+  gfc_symbol *sym;
+  match m;
+
+  if (gfc_match (" unit =") == MATCH_YES)
+    {
+      m = match_dt_unit (k, dt);
+      if (m != MATCH_NO)
+	return m;
+    }
+
+  if (gfc_match (" fmt =") == MATCH_YES)
+    {
+      m = match_dt_format (dt);
+      if (m != MATCH_NO)
+	return m;
+    }
+
+  if (gfc_match (" nml = %n", name) == MATCH_YES)
+    {
+      if (dt->namelist != NULL)
+	{
+	  gfc_error ("Duplicate NML specification at %C");
+	  return MATCH_ERROR;
+	}
+
+      if (gfc_find_symbol (name, NULL, 1, &sym))
+	return MATCH_ERROR;
+
+      if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
+	{
+	  gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
+		     sym != NULL ? sym->name : name);
+	  return MATCH_ERROR;
+	}
+
+      dt->namelist = sym;
+      if (k == M_READ && check_namelist (sym))
+	return MATCH_ERROR;
+
+      return MATCH_YES;
+    }
+
+  m = match_etag (&tag_e_async, &dt->asynchronous);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_blank, &dt->blank);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_delim, &dt->delim);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_pad, &dt->pad);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_sign, &dt->sign);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_round, &dt->round);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_id, &dt->id);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_e_decimal, &dt->decimal);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_rec, &dt->rec);
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_spos, &dt->pos);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_iomsg, &dt->iomsg);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_iostat, &dt->iostat);
+  if (m != MATCH_NO)
+    return m;
+  m = match_ltag (&tag_err, &dt->err);
+  if (m == MATCH_YES)
+    dt->err_where = gfc_current_locus;
+  if (m != MATCH_NO)
+    return m;
+  m = match_etag (&tag_advance, &dt->advance);
+  if (m != MATCH_NO)
+    return m;
+  m = match_out_tag (&tag_size, &dt->size);
+  if (m != MATCH_NO)
+    return m;
+
+  m = match_ltag (&tag_end, &dt->end);
+  if (m == MATCH_YES)
+    {
+      if (k == M_WRITE)
+       {
+	 gfc_error ("END tag at %C not allowed in output statement");
+	 return MATCH_ERROR;
+       }
+      dt->end_where = gfc_current_locus;
+    }
+  if (m != MATCH_NO)
+    return m;
+
+  m = match_ltag (&tag_eor, &dt->eor);
+  if (m == MATCH_YES)
+    dt->eor_where = gfc_current_locus;
+  if (m != MATCH_NO)
+    return m;
+
+  return MATCH_NO;
+}
+
+
+/* Free a data transfer structure and everything below it.  */
+
+void
+gfc_free_dt (gfc_dt *dt)
+{
+  if (dt == NULL)
+    return;
+
+  gfc_free_expr (dt->io_unit);
+  gfc_free_expr (dt->format_expr);
+  gfc_free_expr (dt->rec);
+  gfc_free_expr (dt->advance);
+  gfc_free_expr (dt->iomsg);
+  gfc_free_expr (dt->iostat);
+  gfc_free_expr (dt->size);
+  gfc_free_expr (dt->pad);
+  gfc_free_expr (dt->delim);
+  gfc_free_expr (dt->sign);
+  gfc_free_expr (dt->round);
+  gfc_free_expr (dt->blank);
+  gfc_free_expr (dt->decimal);
+  gfc_free_expr (dt->pos);
+  gfc_free_expr (dt->dt_io_kind);
+  /* dt->extra_comma is a link to dt_io_kind if it is set.  */
+  gfc_free (dt);
+}
+
+
+/* Resolve everything in a gfc_dt structure.  */
+
+gfc_try
+gfc_resolve_dt (gfc_dt *dt, locus *loc)
+{
+  gfc_expr *e;
+  io_kind k;
+
+  /* This is set in any case.  */
+  gcc_assert (dt->dt_io_kind);
+  k = dt->dt_io_kind->value.iokind;
+
+  RESOLVE_TAG (&tag_format, dt->format_expr);
+  RESOLVE_TAG (&tag_rec, dt->rec);
+  RESOLVE_TAG (&tag_spos, dt->pos);
+  RESOLVE_TAG (&tag_advance, dt->advance);
+  RESOLVE_TAG (&tag_id, dt->id);
+  RESOLVE_TAG (&tag_iomsg, dt->iomsg);
+  RESOLVE_TAG (&tag_iostat, dt->iostat);
+  RESOLVE_TAG (&tag_size, dt->size);
+  RESOLVE_TAG (&tag_e_pad, dt->pad);
+  RESOLVE_TAG (&tag_e_delim, dt->delim);
+  RESOLVE_TAG (&tag_e_sign, dt->sign);
+  RESOLVE_TAG (&tag_e_round, dt->round);
+  RESOLVE_TAG (&tag_e_blank, dt->blank);
+  RESOLVE_TAG (&tag_e_decimal, dt->decimal);
+  RESOLVE_TAG (&tag_e_async, dt->asynchronous);
+
+  e = dt->io_unit;
+  if (e == NULL)
+    {
+      gfc_error ("UNIT not specified at %L", loc);
+      return FAILURE;
+    }
+
+  if (gfc_resolve_expr (e) == SUCCESS
+      && (e->ts.type != BT_INTEGER
+	  && (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_VARIABLE)))
+    {
+      /* If there is no extra comma signifying the "format" form of the IO
+	 statement, then this must be an error.  */
+      if (!dt->extra_comma)
+	{
+	  gfc_error ("UNIT specification at %L must be an INTEGER expression "
+		     "or a CHARACTER variable", &e->where);
+	  return FAILURE;
+	}
+      else
+	{
+	  /* At this point, we have an extra comma.  If io_unit has arrived as
+	     type character, we assume its really the "format" form of the I/O
+	     statement.  We set the io_unit to the default unit and format to
+	     the character expression.  See F95 Standard section 9.4.  */
+	  if (e->ts.type == BT_CHARACTER && (k == M_READ || k == M_PRINT))
+	    {
+	      dt->format_expr = dt->io_unit;
+	      dt->io_unit = default_unit (k);
+
+	      /* Nullify this pointer now so that a warning/error is not
+		 triggered below for the "Extension".  */
+	      dt->extra_comma = NULL;
+	    }
+
+	  if (k == M_WRITE)
+	    {
+	      gfc_error ("Invalid form of WRITE statement at %L, UNIT required",
+			 &dt->extra_comma->where);
+	      return FAILURE;
+	    }
+	}
+    }
+
+  if (e->ts.type == BT_CHARACTER)
+    {
+      if (gfc_has_vector_index (e))
+	{
+	  gfc_error ("Internal unit with vector subscript at %L", &e->where);
+	  return FAILURE;
+	}
+
+      /* If we are writing, make sure the internal unit can be changed.  */
+      gcc_assert (k != M_PRINT);
+      if (k == M_WRITE
+	  && gfc_check_vardef_context (e, false, _("internal unit in WRITE"))
+	       == FAILURE)
+	return FAILURE;
+    }
+
+  if (e->rank && e->ts.type != BT_CHARACTER)
+    {
+      gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
+      return FAILURE;
+    }
+
+  if (e->expr_type == EXPR_CONSTANT && e->ts.type == BT_INTEGER
+      && mpz_sgn (e->value.integer) < 0)
+    {
+      gfc_error ("UNIT number in statement at %L must be non-negative",
+		 &e->where);
+      return FAILURE;
+    }
+
+  /* If we are reading and have a namelist, check that all namelist symbols
+     can appear in a variable definition context.  */
+  if (k == M_READ && dt->namelist)
+    {
+      gfc_namelist* n;
+      for (n = dt->namelist->namelist; n; n = n->next)
+	{
+	  gfc_expr* e;
+	  gfc_try t;
+
+	  e = gfc_get_variable_expr (gfc_find_sym_in_symtree (n->sym));
+	  t = gfc_check_vardef_context (e, false, NULL);
+	  gfc_free_expr (e);
+
+	  if (t == FAILURE)
+	    {
+	      gfc_error ("NAMELIST '%s' in READ statement at %L contains"
+			 " the symbol '%s' which may not appear in a"
+			 " variable definition context",
+			 dt->namelist->name, loc, n->sym->name);
+	      return FAILURE;
+	    }
+	}
+    }
+
+  if (dt->extra_comma
+      && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before i/o "
+			 "item list at %L", &dt->extra_comma->where) == FAILURE)
+    return FAILURE;
+
+  if (dt->err)
+    {
+      if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
+	return FAILURE;
+      if (dt->err->defined == ST_LABEL_UNKNOWN)
+	{
+	  gfc_error ("ERR tag label %d at %L not defined",
+		      dt->err->value, &dt->err_where);
+	  return FAILURE;
+	}
+    }
+
+  if (dt->end)
+    {
+      if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
+	return FAILURE;
+      if (dt->end->defined == ST_LABEL_UNKNOWN)
+	{
+	  gfc_error ("END tag label %d at %L not defined",
+		      dt->end->value, &dt->end_where);
+	  return FAILURE;
+	}
+    }
+
+  if (dt->eor)
+    {
+      if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
+	return FAILURE;
+      if (dt->eor->defined == ST_LABEL_UNKNOWN)
+	{
+	  gfc_error ("EOR tag label %d at %L not defined",
+		      dt->eor->value, &dt->eor_where);
+	  return FAILURE;
+	}
+    }
+
+  /* Check the format label actually exists.  */
+  if (dt->format_label && dt->format_label != &format_asterisk
+      && dt->format_label->defined == ST_LABEL_UNKNOWN)
+    {
+      gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
+		 &dt->format_label->where);
+      return FAILURE;
+    }
+
+  return SUCCESS;
+}
+
+
+/* Given an io_kind, return its name.  */
+
+static const char *
+io_kind_name (io_kind k)
+{
+  const char *name;
+
+  switch (k)
+    {
+    case M_READ:
+      name = "READ";
+      break;
+    case M_WRITE:
+      name = "WRITE";
+      break;
+    case M_PRINT:
+      name = "PRINT";
+      break;
+    case M_INQUIRE:
+      name = "INQUIRE";
+      break;
+    default:
+      gfc_internal_error ("io_kind_name(): bad I/O-kind");
+    }
+
+  return name;
+}
+
+
+/* Match an IO iteration statement of the form:
+
+   ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
+
+   which is equivalent to a single IO element.  This function is
+   mutually recursive with match_io_element().  */
+
+static match match_io_element (io_kind, gfc_code **);
+
+static match
+match_io_iterator (io_kind k, gfc_code **result)
+{
+  gfc_code *head, *tail, *new_code;
+  gfc_iterator *iter;
+  locus old_loc;
+  match m;
+  int n;
+
+  iter = NULL;
+  head = NULL;
+  old_loc = gfc_current_locus;
+
+  if (gfc_match_char ('(') != MATCH_YES)
+    return MATCH_NO;
+
+  m = match_io_element (k, &head);
+  tail = head;
+
+  if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
+    {
+      m = MATCH_NO;
+      goto cleanup;
+    }
+
+  /* Can't be anything but an IO iterator.  Build a list.  */
+  iter = gfc_get_iterator ();
+
+  for (n = 1;; n++)
+    {
+      m = gfc_match_iterator (iter, 0);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_YES)
+	{
+	  gfc_check_do_variable (iter->var->symtree);
+	  break;
+	}
+
+      m = match_io_element (k, &new_code);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	{
+	  if (n > 2)
+	    goto syntax;
+	  goto cleanup;
+	}
+
+      tail = gfc_append_code (tail, new_code);
+
+      if (gfc_match_char (',') != MATCH_YES)
+	{
+	  if (n > 2)
+	    goto syntax;
+	  m = MATCH_NO;
+	  goto cleanup;
+	}
+    }
+
+  if (gfc_match_char (')') != MATCH_YES)
+    goto syntax;
+
+  new_code = gfc_get_code ();
+  new_code->op = EXEC_DO;
+  new_code->ext.iterator = iter;
+
+  new_code->block = gfc_get_code ();
+  new_code->block->op = EXEC_DO;
+  new_code->block->next = head;
+
+  *result = new_code;
+  return MATCH_YES;
+
+syntax:
+  gfc_error ("Syntax error in I/O iterator at %C");
+  m = MATCH_ERROR;
+
+cleanup:
+  gfc_free_iterator (iter, 1);
+  gfc_free_statements (head);
+  gfc_current_locus = old_loc;
+  return m;
+}
+
+
+/* Match a single element of an IO list, which is either a single
+   expression or an IO Iterator.  */
+
+static match
+match_io_element (io_kind k, gfc_code **cpp)
+{
+  gfc_expr *expr;
+  gfc_code *cp;
+  match m;
+
+  expr = NULL;
+
+  m = match_io_iterator (k, cpp);
+  if (m == MATCH_YES)
+    return MATCH_YES;
+
+  if (k == M_READ)
+    {
+      m = gfc_match_variable (&expr, 0);
+      if (m == MATCH_NO)
+	gfc_error ("Expected variable in READ statement at %C");
+    }
+  else
+    {
+      m = gfc_match_expr (&expr);
+      if (m == MATCH_NO)
+	gfc_error ("Expected expression in %s statement at %C",
+		   io_kind_name (k));
+    }
+
+  if (m == MATCH_YES && k == M_READ && gfc_check_do_variable (expr->symtree))
+    m = MATCH_ERROR;
+
+  if (m != MATCH_YES)
+    {
+      gfc_free_expr (expr);
+      return MATCH_ERROR;
+    }
+
+  cp = gfc_get_code ();
+  cp->op = EXEC_TRANSFER;
+  cp->expr1 = expr;
+  if (k != M_INQUIRE)
+    cp->ext.dt = current_dt;
+
+  *cpp = cp;
+  return MATCH_YES;
+}
+
+
+/* Match an I/O list, building gfc_code structures as we go.  */
+
+static match
+match_io_list (io_kind k, gfc_code **head_p)
+{
+  gfc_code *head, *tail, *new_code;
+  match m;
+
+  *head_p = head = tail = NULL;
+  if (gfc_match_eos () == MATCH_YES)
+    return MATCH_YES;
+
+  for (;;)
+    {
+      m = match_io_element (k, &new_code);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+
+      tail = gfc_append_code (tail, new_code);
+      if (head == NULL)
+	head = new_code;
+
+      if (gfc_match_eos () == MATCH_YES)
+	break;
+      if (gfc_match_char (',') != MATCH_YES)
+	goto syntax;
+    }
+
+  *head_p = head;
+  return MATCH_YES;
+
+syntax:
+  gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
+
+cleanup:
+  gfc_free_statements (head);
+  return MATCH_ERROR;
+}
+
+
+/* Attach the data transfer end node.  */
+
+static void
+terminate_io (gfc_code *io_code)
+{
+  gfc_code *c;
+
+  if (io_code == NULL)
+    io_code = new_st.block;
+
+  c = gfc_get_code ();
+  c->op = EXEC_DT_END;
+
+  /* Point to structure that is already there */
+  c->ext.dt = new_st.ext.dt;
+  gfc_append_code (io_code, c);
+}
+
+
+/* Check the constraints for a data transfer statement.  The majority of the
+   constraints appearing in 9.4 of the standard appear here.  Some are handled
+   in resolve_tag and others in gfc_resolve_dt.  */
+
+static match
+check_io_constraints (io_kind k, gfc_dt *dt, gfc_code *io_code,
+		      locus *spec_end)
+{
+#define io_constraint(condition,msg,arg)\
+if (condition) \
+  {\
+    gfc_error(msg,arg);\
+    m = MATCH_ERROR;\
+  }
+
+  match m;
+  gfc_expr *expr;
+  gfc_symbol *sym = NULL;
+  bool warn, unformatted;
+
+  warn = (dt->err || dt->iostat) ? true : false;
+  unformatted = dt->format_expr == NULL && dt->format_label == NULL
+		&& dt->namelist == NULL;
+
+  m = MATCH_YES;
+
+  expr = dt->io_unit;
+  if (expr && expr->expr_type == EXPR_VARIABLE
+      && expr->ts.type == BT_CHARACTER)
+    {
+      sym = expr->symtree->n.sym;
+
+      io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
+		     "Internal file at %L must not be INTENT(IN)",
+		     &expr->where);
+
+      io_constraint (gfc_has_vector_index (dt->io_unit),
+		     "Internal file incompatible with vector subscript at %L",
+		     &expr->where);
+
+      io_constraint (dt->rec != NULL,
+		     "REC tag at %L is incompatible with internal file",
+		     &dt->rec->where);
+    
+      io_constraint (dt->pos != NULL,
+		     "POS tag at %L is incompatible with internal file",
+		     &dt->pos->where);
+
+      io_constraint (unformatted,
+		     "Unformatted I/O not allowed with internal unit at %L",
+		     &dt->io_unit->where);
+
+      io_constraint (dt->asynchronous != NULL,
+		     "ASYNCHRONOUS tag at %L not allowed with internal file",
+		     &dt->asynchronous->where);
+
+      if (dt->namelist != NULL)
+	{
+	  if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Internal file "
+			      "at %L with namelist", &expr->where)
+	      == FAILURE)
+	    m = MATCH_ERROR;
+	}
+
+      io_constraint (dt->advance != NULL,
+		     "ADVANCE tag at %L is incompatible with internal file",
+		     &dt->advance->where);
+    }
+
+  if (expr && expr->ts.type != BT_CHARACTER)
+    {
+
+      io_constraint (gfc_pure (NULL) && (k == M_READ || k == M_WRITE),
+		     "IO UNIT in %s statement at %C must be "
+		     "an internal file in a PURE procedure",
+		     io_kind_name (k));
+
+      if (gfc_implicit_pure (NULL) && (k == M_READ || k == M_WRITE))
+	gfc_current_ns->proc_name->attr.implicit_pure = 0;
+
+    }
+
+  if (k != M_READ)
+    {
+      io_constraint (dt->end, "END tag not allowed with output at %L",
+		     &dt->end_where);
+
+      io_constraint (dt->eor, "EOR tag not allowed with output at %L",
+		     &dt->eor_where);
+
+      io_constraint (dt->blank, "BLANK= specifier not allowed with output at %L",
+		     &dt->blank->where);
+
+      io_constraint (dt->pad, "PAD= specifier not allowed with output at %L",
+		     &dt->pad->where);
+
+      io_constraint (dt->size, "SIZE= specifier not allowed with output at %L",
+		     &dt->size->where);
+    }
+  else
+    {
+      io_constraint (dt->size && dt->advance == NULL,
+		     "SIZE tag at %L requires an ADVANCE tag",
+		     &dt->size->where);
+
+      io_constraint (dt->eor && dt->advance == NULL,
+		     "EOR tag at %L requires an ADVANCE tag",
+		     &dt->eor_where);
+    }
+
+  if (dt->asynchronous) 
+    {
+      static const char * asynchronous[] = { "YES", "NO", NULL };
+
+      if (gfc_reduce_init_expr (dt->asynchronous) != SUCCESS)
+	{
+	  gfc_error ("ASYNCHRONOUS= specifier at %L must be an initialization "
+		     "expression", &dt->asynchronous->where);
+	  return MATCH_ERROR;
+	}
+
+      if (!compare_to_allowed_values
+		("ASYNCHRONOUS", asynchronous, NULL, NULL,
+		 dt->asynchronous->value.character.string,
+		 io_kind_name (k), warn))
+	return MATCH_ERROR;
+    }
+
+  if (dt->id)
+    {
+      bool not_yes
+	= !dt->asynchronous
+	  || gfc_wide_strlen (dt->asynchronous->value.character.string) != 3
+	  || gfc_wide_strncasecmp (dt->asynchronous->value.character.string,
+				   "yes", 3) != 0;
+      io_constraint (not_yes,
+		     "ID= specifier at %L must be with ASYNCHRONOUS='yes' "
+		     "specifier", &dt->id->where);
+    }
+
+  if (dt->decimal)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DECIMAL= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	return MATCH_ERROR;
+
+      if (dt->decimal->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * decimal[] = { "COMMA", "POINT", NULL };
+
+	  if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
+					  dt->decimal->value.character.string,
+					  io_kind_name (k), warn))
+	    return MATCH_ERROR;
+
+	  io_constraint (unformatted,
+			 "the DECIMAL= specifier at %L must be with an "
+			 "explicit format expression", &dt->decimal->where);
+	}
+    }
+  
+  if (dt->blank)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BLANK= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	return MATCH_ERROR;
+
+      if (dt->blank->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * blank[] = { "NULL", "ZERO", NULL };
+
+	  if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
+					  dt->blank->value.character.string,
+					  io_kind_name (k), warn))
+	    return MATCH_ERROR;
+
+	  io_constraint (unformatted,
+			 "the BLANK= specifier at %L must be with an "
+			 "explicit format expression", &dt->blank->where);
+	}
+    }
+
+  if (dt->pad)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PAD= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	return MATCH_ERROR;
+
+      if (dt->pad->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * pad[] = { "YES", "NO", NULL };
+
+	  if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
+					  dt->pad->value.character.string,
+					  io_kind_name (k), warn))
+	    return MATCH_ERROR;
+
+	  io_constraint (unformatted,
+			 "the PAD= specifier at %L must be with an "
+			 "explicit format expression", &dt->pad->where);
+	}
+    }
+
+  if (dt->round)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ROUND= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	return MATCH_ERROR;
+
+      if (dt->round->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
+					  "COMPATIBLE", "PROCESSOR_DEFINED",
+					  NULL };
+
+	  if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
+					  dt->round->value.character.string,
+					  io_kind_name (k), warn))
+	    return MATCH_ERROR;
+	}
+    }
+  
+  if (dt->sign)
+    {
+      /* When implemented, change the following to use gfc_notify_std F2003.
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SIGN= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	return MATCH_ERROR;  */
+      if (dt->sign->expr_type == EXPR_CONSTANT)
+	{
+	  static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
+					 NULL };
+
+	  if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
+				      dt->sign->value.character.string,
+				      io_kind_name (k), warn))
+	    return MATCH_ERROR;
+
+	  io_constraint (unformatted,
+			 "SIGN= specifier at %L must be with an "
+			 "explicit format expression", &dt->sign->where);
+
+	  io_constraint (k == M_READ,
+			 "SIGN= specifier at %L not allowed in a "
+			 "READ statement", &dt->sign->where);
+	}
+    }
+
+  if (dt->delim)
+    {
+      if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DELIM= at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+	return MATCH_ERROR;
+
+      if (dt->delim->expr_type == EXPR_CONSTANT)
+	{
+	  static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
+
+	  if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
+					  dt->delim->value.character.string,
+					  io_kind_name (k), warn))
+	    return MATCH_ERROR;
+
+	  io_constraint (k == M_READ,
+			 "DELIM= specifier at %L not allowed in a "
+			 "READ statement", &dt->delim->where);
+      
+	  io_constraint (dt->format_label != &format_asterisk
+			 && dt->namelist == NULL,
+			 "DELIM= specifier at %L must have FMT=*",
+			 &dt->delim->where);
+
+	  io_constraint (unformatted && dt->namelist == NULL,
+			 "DELIM= specifier at %L must be with FMT=* or "
+			 "NML= specifier ", &dt->delim->where);
+	}
+    }
+  
+  if (dt->namelist)
+    {
+      io_constraint (io_code && dt->namelist,
+		     "NAMELIST cannot be followed by IO-list at %L",
+		     &io_code->loc);
+
+      io_constraint (dt->format_expr,
+		     "IO spec-list cannot contain both NAMELIST group name "
+		     "and format specification at %L",
+		     &dt->format_expr->where);
+
+      io_constraint (dt->format_label,
+		     "IO spec-list cannot contain both NAMELIST group name "
+		     "and format label at %L", spec_end);
+
+      io_constraint (dt->rec,
+		     "NAMELIST IO is not allowed with a REC= specifier "
+		     "at %L", &dt->rec->where);
+
+      io_constraint (dt->advance,
+		     "NAMELIST IO is not allowed with a ADVANCE= specifier "
+		     "at %L", &dt->advance->where);
+    }
+
+  if (dt->rec)
+    {
+      io_constraint (dt->end,
+		     "An END tag is not allowed with a "
+		     "REC= specifier at %L", &dt->end_where);
+
+      io_constraint (dt->format_label == &format_asterisk,
+		     "FMT=* is not allowed with a REC= specifier "
+		     "at %L", spec_end);
+
+      io_constraint (dt->pos,
+		     "POS= is not allowed with REC= specifier "
+		     "at %L", &dt->pos->where);
+    }
+
+  if (dt->advance)
+    {
+      int not_yes, not_no;
+      expr = dt->advance;
+
+      io_constraint (dt->format_label == &format_asterisk,
+		     "List directed format(*) is not allowed with a "
+		     "ADVANCE= specifier at %L.", &expr->where);
+
+      io_constraint (unformatted,
+		     "the ADVANCE= specifier at %L must appear with an "
+		     "explicit format expression", &expr->where);
+
+      if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER)
+	{
+	  const gfc_char_t *advance = expr->value.character.string;
+	  not_no = gfc_wide_strlen (advance) != 2
+		   || gfc_wide_strncasecmp (advance, "no", 2) != 0;
+	  not_yes = gfc_wide_strlen (advance) != 3
+		    || gfc_wide_strncasecmp (advance, "yes", 3) != 0;
+	}
+      else
+	{
+	  not_no = 0;
+	  not_yes = 0;
+	}
+
+      io_constraint (not_no && not_yes,
+		     "ADVANCE= specifier at %L must have value = "
+		     "YES or NO.", &expr->where);
+
+      io_constraint (dt->size && not_no && k == M_READ,
+		     "SIZE tag at %L requires an ADVANCE = 'NO'",
+		     &dt->size->where);
+
+      io_constraint (dt->eor && not_no && k == M_READ,
+		     "EOR tag at %L requires an ADVANCE = 'NO'",
+		     &dt->eor_where);      
+    }
+
+  expr = dt->format_expr;
+  if (gfc_simplify_expr (expr, 0) == FAILURE
+      || check_format_string (expr, k == M_READ) == FAILURE)
+    return MATCH_ERROR;
+
+  return m;
+}
+#undef io_constraint
+
+
+/* Match a READ, WRITE or PRINT statement.  */
+
+static match
+match_io (io_kind k)
+{
+  char name[GFC_MAX_SYMBOL_LEN + 1];
+  gfc_code *io_code;
+  gfc_symbol *sym;
+  int comma_flag;
+  locus where;
+  locus spec_end;
+  gfc_dt *dt;
+  match m;
+
+  where = gfc_current_locus;
+  comma_flag = 0;
+  current_dt = dt = XCNEW (gfc_dt);
+  m = gfc_match_char ('(');
+  if (m == MATCH_NO)
+    {
+      where = gfc_current_locus;
+      if (k == M_WRITE)
+	goto syntax;
+      else if (k == M_PRINT)
+	{
+	  /* Treat the non-standard case of PRINT namelist.  */
+	  if ((gfc_current_form == FORM_FIXED || gfc_peek_ascii_char () == ' ')
+	      && gfc_match_name (name) == MATCH_YES)
+	    {
+	      gfc_find_symbol (name, NULL, 1, &sym);
+	      if (sym && sym->attr.flavor == FL_NAMELIST)
+		{
+		  if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
+				      "%C is an extension") == FAILURE)
+		    {
+		      m = MATCH_ERROR;
+		      goto cleanup;
+		    }
+
+		  dt->io_unit = default_unit (k);
+		  dt->namelist = sym;
+		  goto get_io_list;
+		}
+	      else
+		gfc_current_locus = where;
+	    }
+	}
+
+      if (gfc_current_form == FORM_FREE)
+	{
+	  char c = gfc_peek_ascii_char ();
+	  if (c != ' ' && c != '*' && c != '\'' && c != '"')
+	    {
+	      m = MATCH_NO;
+	      goto cleanup;
+	    }
+	}
+
+      m = match_dt_format (dt);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+
+      comma_flag = 1;
+      dt->io_unit = default_unit (k);
+      goto get_io_list;
+    }
+  else
+    {
+      /* Before issuing an error for a malformed 'print (1,*)' type of
+	 error, check for a default-char-expr of the form ('(I0)').  */
+      if (k == M_PRINT && m == MATCH_YES)
+	{
+	  /* Reset current locus to get the initial '(' in an expression.  */
+	  gfc_current_locus = where;
+	  dt->format_expr = NULL;
+	  m = match_dt_format (dt);
+
+	  if (m == MATCH_ERROR)
+	    goto cleanup;
+	  if (m == MATCH_NO || dt->format_expr == NULL)
+	    goto syntax;
+
+	  comma_flag = 1;
+	  dt->io_unit = default_unit (k);
+	  goto get_io_list;
+	}
+    }
+
+  /* Match a control list */
+  if (match_dt_element (k, dt) == MATCH_YES)
+    goto next;
+  if (match_dt_unit (k, dt) != MATCH_YES)
+    goto loop;
+
+  if (gfc_match_char (')') == MATCH_YES)
+    goto get_io_list;
+  if (gfc_match_char (',') != MATCH_YES)
+    goto syntax;
+
+  m = match_dt_element (k, dt);
+  if (m == MATCH_YES)
+    goto next;
+  if (m == MATCH_ERROR)
+    goto cleanup;
+
+  m = match_dt_format (dt);
+  if (m == MATCH_YES)
+    goto next;
+  if (m == MATCH_ERROR)
+    goto cleanup;
+
+  where = gfc_current_locus;
+
+  m = gfc_match_name (name);
+  if (m == MATCH_YES)
+    {
+      gfc_find_symbol (name, NULL, 1, &sym);
+      if (sym && sym->attr.flavor == FL_NAMELIST)
+	{
+	  dt->namelist = sym;
+	  if (k == M_READ && check_namelist (sym))
+	    {
+	      m = MATCH_ERROR;
+	      goto cleanup;
+	    }
+	  goto next;
+	}
+    }
+
+  gfc_current_locus = where;
+
+  goto loop;			/* No matches, try regular elements */
+
+next:
+  if (gfc_match_char (')') == MATCH_YES)
+    goto get_io_list;
+  if (gfc_match_char (',') != MATCH_YES)
+    goto syntax;
+
+loop:
+  for (;;)
+    {
+      m = match_dt_element (k, dt);
+      if (m == MATCH_NO)
+	goto syntax;
+      if (m == MATCH_ERROR)
+	goto cleanup;
+
+      if (gfc_match_char (')') == MATCH_YES)
+	break;
+      if (gfc_match_char (',') != MATCH_YES)
+	goto syntax;
+    }
+
+get_io_list:
+
+  /* Used in check_io_constraints, where no locus is available.  */
+  spec_end = gfc_current_locus;
+
+  /* Save the IO kind for later use.  */
+  dt->dt_io_kind = gfc_get_iokind_expr (&gfc_current_locus, k);
+
+  /* Optional leading comma (non-standard).  We use a gfc_expr structure here
+     to save the locus.  This is used later when resolving transfer statements
+     that might have a format expression without unit number.  */
+  if (!comma_flag && gfc_match_char (',') == MATCH_YES)
+    dt->extra_comma = dt->dt_io_kind;
+
+  io_code = NULL;
+  if (gfc_match_eos () != MATCH_YES)
+    {
+      if (comma_flag && gfc_match_char (',') != MATCH_YES)
+	{
+	  gfc_error ("Expected comma in I/O list at %C");
+	  m = MATCH_ERROR;
+	  goto cleanup;
+	}
+
+      m = match_io_list (k, &io_code);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+    }
+
+  /* A full IO statement has been matched.  Check the constraints.  spec_end is
+     supplied for cases where no locus is supplied.  */
+  m = check_io_constraints (k, dt, io_code, &spec_end);
+
+  if (m == MATCH_ERROR)
+    goto cleanup;
+
+  new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
+  new_st.ext.dt = dt;
+  new_st.block = gfc_get_code ();
+  new_st.block->op = new_st.op;
+  new_st.block->next = io_code;
+
+  terminate_io (io_code);
+
+  return MATCH_YES;
+
+syntax:
+  gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
+  m = MATCH_ERROR;
+
+cleanup:
+  gfc_free_dt (dt);
+  return m;
+}
+
+
+match
+gfc_match_read (void)
+{
+  return match_io (M_READ);
+}
+
+
+match
+gfc_match_write (void)
+{
+  return match_io (M_WRITE);
+}
+
+
+match
+gfc_match_print (void)
+{
+  match m;
+
+  m = match_io (M_PRINT);
+  if (m != MATCH_YES)
+    return m;
+
+  if (gfc_pure (NULL))
+    {
+      gfc_error ("PRINT statement at %C not allowed within PURE procedure");
+      return MATCH_ERROR;
+    }
+
+  if (gfc_implicit_pure (NULL))
+    gfc_current_ns->proc_name->attr.implicit_pure = 0;
+
+  return MATCH_YES;
+}
+
+
+/* Free a gfc_inquire structure.  */
+
+void
+gfc_free_inquire (gfc_inquire *inquire)
+{
+
+  if (inquire == NULL)
+    return;
+
+  gfc_free_expr (inquire->unit);
+  gfc_free_expr (inquire->file);
+  gfc_free_expr (inquire->iomsg);
+  gfc_free_expr (inquire->iostat);
+  gfc_free_expr (inquire->exist);
+  gfc_free_expr (inquire->opened);
+  gfc_free_expr (inquire->number);
+  gfc_free_expr (inquire->named);
+  gfc_free_expr (inquire->name);
+  gfc_free_expr (inquire->access);
+  gfc_free_expr (inquire->sequential);
+  gfc_free_expr (inquire->direct);
+  gfc_free_expr (inquire->form);
+  gfc_free_expr (inquire->formatted);
+  gfc_free_expr (inquire->unformatted);
+  gfc_free_expr (inquire->recl);
+  gfc_free_expr (inquire->nextrec);
+  gfc_free_expr (inquire->blank);
+  gfc_free_expr (inquire->position);
+  gfc_free_expr (inquire->action);
+  gfc_free_expr (inquire->read);
+  gfc_free_expr (inquire->write);
+  gfc_free_expr (inquire->readwrite);
+  gfc_free_expr (inquire->delim);
+  gfc_free_expr (inquire->encoding);
+  gfc_free_expr (inquire->pad);
+  gfc_free_expr (inquire->iolength);
+  gfc_free_expr (inquire->convert);
+  gfc_free_expr (inquire->strm_pos);
+  gfc_free_expr (inquire->asynchronous);
+  gfc_free_expr (inquire->decimal);
+  gfc_free_expr (inquire->pending);
+  gfc_free_expr (inquire->id);
+  gfc_free_expr (inquire->sign);
+  gfc_free_expr (inquire->size);
+  gfc_free_expr (inquire->round);
+  gfc_free (inquire);
+}
+
+
+/* Match an element of an INQUIRE statement.  */
+
+#define RETM   if (m != MATCH_NO) return m;
+
+static match
+match_inquire_element (gfc_inquire *inquire)
+{
+  match m;
+
+  m = match_etag (&tag_unit, &inquire->unit);
+  RETM m = match_etag (&tag_file, &inquire->file);
+  RETM m = match_ltag (&tag_err, &inquire->err);
+  RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
+  RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
+  RETM m = match_vtag (&tag_exist, &inquire->exist);
+  RETM m = match_vtag (&tag_opened, &inquire->opened);
+  RETM m = match_vtag (&tag_named, &inquire->named);
+  RETM m = match_vtag (&tag_name, &inquire->name);
+  RETM m = match_out_tag (&tag_number, &inquire->number);
+  RETM m = match_vtag (&tag_s_access, &inquire->access);
+  RETM m = match_vtag (&tag_sequential, &inquire->sequential);
+  RETM m = match_vtag (&tag_direct, &inquire->direct);
+  RETM m = match_vtag (&tag_s_form, &inquire->form);
+  RETM m = match_vtag (&tag_formatted, &inquire->formatted);
+  RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
+  RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
+  RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
+  RETM m = match_vtag (&tag_s_blank, &inquire->blank);
+  RETM m = match_vtag (&tag_s_position, &inquire->position);
+  RETM m = match_vtag (&tag_s_action, &inquire->action);
+  RETM m = match_vtag (&tag_read, &inquire->read);
+  RETM m = match_vtag (&tag_write, &inquire->write);
+  RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
+  RETM m = match_vtag (&tag_s_async, &inquire->asynchronous);
+  RETM m = match_vtag (&tag_s_delim, &inquire->delim);
+  RETM m = match_vtag (&tag_s_decimal, &inquire->decimal);
+  RETM m = match_vtag (&tag_size, &inquire->size);
+  RETM m = match_vtag (&tag_s_encoding, &inquire->encoding);
+  RETM m = match_vtag (&tag_s_round, &inquire->round);
+  RETM m = match_vtag (&tag_s_sign, &inquire->sign);
+  RETM m = match_vtag (&tag_s_pad, &inquire->pad);
+  RETM m = match_vtag (&tag_iolength, &inquire->iolength);
+  RETM m = match_vtag (&tag_convert, &inquire->convert);
+  RETM m = match_out_tag (&tag_strm_out, &inquire->strm_pos);
+  RETM m = match_vtag (&tag_pending, &inquire->pending);
+  RETM m = match_vtag (&tag_id, &inquire->id);
+  RETM return MATCH_NO;
+}
+
+#undef RETM
+
+
+match
+gfc_match_inquire (void)
+{
+  gfc_inquire *inquire;
+  gfc_code *code;
+  match m;
+  locus loc;
+
+  m = gfc_match_char ('(');
+  if (m == MATCH_NO)
+    return m;
+
+  inquire = XCNEW (gfc_inquire);
+
+  loc = gfc_current_locus;
+
+  m = match_inquire_element (inquire);
+  if (m == MATCH_ERROR)
+    goto cleanup;
+  if (m == MATCH_NO)
+    {
+      m = gfc_match_expr (&inquire->unit);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+    }
+
+  /* See if we have the IOLENGTH form of the inquire statement.  */
+  if (inquire->iolength != NULL)
+    {
+      if (gfc_match_char (')') != MATCH_YES)
+	goto syntax;
+
+      m = match_io_list (M_INQUIRE, &code);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+
+      new_st.op = EXEC_IOLENGTH;
+      new_st.expr1 = inquire->iolength;
+      new_st.ext.inquire = inquire;
+
+      if (gfc_pure (NULL))
+	{
+	  gfc_free_statements (code);
+	  gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
+	  return MATCH_ERROR;
+	}
+
+      if (gfc_implicit_pure (NULL))
+	gfc_current_ns->proc_name->attr.implicit_pure = 0;
+
+      new_st.block = gfc_get_code ();
+      new_st.block->op = EXEC_IOLENGTH;
+      terminate_io (code);
+      new_st.block->next = code;
+      return MATCH_YES;
+    }
+
+  /* At this point, we have the non-IOLENGTH inquire statement.  */
+  for (;;)
+    {
+      if (gfc_match_char (')') == MATCH_YES)
+	break;
+      if (gfc_match_char (',') != MATCH_YES)
+	goto syntax;
+
+      m = match_inquire_element (inquire);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+
+      if (inquire->iolength != NULL)
+	{
+	  gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
+	  goto cleanup;
+	}
+    }
+
+  if (gfc_match_eos () != MATCH_YES)
+    goto syntax;
+
+  if (inquire->unit != NULL && inquire->file != NULL)
+    {
+      gfc_error ("INQUIRE statement at %L cannot contain both FILE and "
+		 "UNIT specifiers", &loc);
+      goto cleanup;
+    }
+
+  if (inquire->unit == NULL && inquire->file == NULL)
+    {
+      gfc_error ("INQUIRE statement at %L requires either FILE or "
+		 "UNIT specifier", &loc);
+      goto cleanup;
+    }
+
+  if (gfc_pure (NULL))
+    {
+      gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
+      goto cleanup;
+    }
+
+  if (gfc_implicit_pure (NULL))
+    gfc_current_ns->proc_name->attr.implicit_pure = 0;
+  
+  if (inquire->id != NULL && inquire->pending == NULL)
+    {
+      gfc_error ("INQUIRE statement at %L requires a PENDING= specifier with "
+		 "the ID= specifier", &loc);
+      goto cleanup;
+    }
+
+  new_st.op = EXEC_INQUIRE;
+  new_st.ext.inquire = inquire;
+  return MATCH_YES;
+
+syntax:
+  gfc_syntax_error (ST_INQUIRE);
+
+cleanup:
+  gfc_free_inquire (inquire);
+  return MATCH_ERROR;
+}
+
+
+/* Resolve everything in a gfc_inquire structure.  */
+
+gfc_try
+gfc_resolve_inquire (gfc_inquire *inquire)
+{
+  RESOLVE_TAG (&tag_unit, inquire->unit);
+  RESOLVE_TAG (&tag_file, inquire->file);
+  RESOLVE_TAG (&tag_id, inquire->id);
+
+  /* For INQUIRE, all tags except FILE, ID and UNIT are variable definition
+     contexts.  Thus, use an extended RESOLVE_TAG macro for that.  */
+#define INQUIRE_RESOLVE_TAG(tag, expr) \
+  RESOLVE_TAG (tag, expr); \
+  if (expr) \
+    { \
+      char context[64]; \
+      sprintf (context, _("%s tag with INQUIRE"), (tag)->name); \
+      if (gfc_check_vardef_context ((expr), false, context) == FAILURE) \
+	return FAILURE; \
+    }
+  INQUIRE_RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
+  INQUIRE_RESOLVE_TAG (&tag_iostat, inquire->iostat);
+  INQUIRE_RESOLVE_TAG (&tag_exist, inquire->exist);
+  INQUIRE_RESOLVE_TAG (&tag_opened, inquire->opened);
+  INQUIRE_RESOLVE_TAG (&tag_number, inquire->number);
+  INQUIRE_RESOLVE_TAG (&tag_named, inquire->named);
+  INQUIRE_RESOLVE_TAG (&tag_name, inquire->name);
+  INQUIRE_RESOLVE_TAG (&tag_s_access, inquire->access);
+  INQUIRE_RESOLVE_TAG (&tag_sequential, inquire->sequential);
+  INQUIRE_RESOLVE_TAG (&tag_direct, inquire->direct);
+  INQUIRE_RESOLVE_TAG (&tag_s_form, inquire->form);
+  INQUIRE_RESOLVE_TAG (&tag_formatted, inquire->formatted);
+  INQUIRE_RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
+  INQUIRE_RESOLVE_TAG (&tag_s_recl, inquire->recl);
+  INQUIRE_RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
+  INQUIRE_RESOLVE_TAG (&tag_s_blank, inquire->blank);
+  INQUIRE_RESOLVE_TAG (&tag_s_position, inquire->position);
+  INQUIRE_RESOLVE_TAG (&tag_s_action, inquire->action);
+  INQUIRE_RESOLVE_TAG (&tag_read, inquire->read);
+  INQUIRE_RESOLVE_TAG (&tag_write, inquire->write);
+  INQUIRE_RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
+  INQUIRE_RESOLVE_TAG (&tag_s_delim, inquire->delim);
+  INQUIRE_RESOLVE_TAG (&tag_s_pad, inquire->pad);
+  INQUIRE_RESOLVE_TAG (&tag_s_encoding, inquire->encoding);
+  INQUIRE_RESOLVE_TAG (&tag_s_round, inquire->round);
+  INQUIRE_RESOLVE_TAG (&tag_iolength, inquire->iolength);
+  INQUIRE_RESOLVE_TAG (&tag_convert, inquire->convert);
+  INQUIRE_RESOLVE_TAG (&tag_strm_out, inquire->strm_pos);
+  INQUIRE_RESOLVE_TAG (&tag_s_async, inquire->asynchronous);
+  INQUIRE_RESOLVE_TAG (&tag_s_sign, inquire->sign);
+  INQUIRE_RESOLVE_TAG (&tag_s_round, inquire->round);
+  INQUIRE_RESOLVE_TAG (&tag_pending, inquire->pending);
+  INQUIRE_RESOLVE_TAG (&tag_size, inquire->size);
+#undef INQUIRE_RESOLVE_TAG
+
+  if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
+    return FAILURE;
+
+  return SUCCESS;
+}
+
+
+void
+gfc_free_wait (gfc_wait *wait)
+{
+  if (wait == NULL)
+    return;
+
+  gfc_free_expr (wait->unit);
+  gfc_free_expr (wait->iostat);
+  gfc_free_expr (wait->iomsg);
+  gfc_free_expr (wait->id);
+}
+
+
+gfc_try
+gfc_resolve_wait (gfc_wait *wait)
+{
+  RESOLVE_TAG (&tag_unit, wait->unit);
+  RESOLVE_TAG (&tag_iomsg, wait->iomsg);
+  RESOLVE_TAG (&tag_iostat, wait->iostat);
+  RESOLVE_TAG (&tag_id, wait->id);
+
+  if (gfc_reference_st_label (wait->err, ST_LABEL_TARGET) == FAILURE)
+    return FAILURE;
+  
+  if (gfc_reference_st_label (wait->end, ST_LABEL_TARGET) == FAILURE)
+    return FAILURE;
+
+  return SUCCESS;
+}
+
+/* Match an element of a WAIT statement.  */
+
+#define RETM   if (m != MATCH_NO) return m;
+
+static match
+match_wait_element (gfc_wait *wait)
+{
+  match m;
+
+  m = match_etag (&tag_unit, &wait->unit);
+  RETM m = match_ltag (&tag_err, &wait->err);
+  RETM m = match_ltag (&tag_end, &wait->eor);
+  RETM m = match_ltag (&tag_eor, &wait->end);
+  RETM m = match_out_tag (&tag_iomsg, &wait->iomsg);
+  RETM m = match_out_tag (&tag_iostat, &wait->iostat);
+  RETM m = match_etag (&tag_id, &wait->id);
+  RETM return MATCH_NO;
+}
+
+#undef RETM
+
+
+match
+gfc_match_wait (void)
+{
+  gfc_wait *wait;
+  match m;
+
+  m = gfc_match_char ('(');
+  if (m == MATCH_NO)
+    return m;
+
+  wait = XCNEW (gfc_wait);
+
+  m = match_wait_element (wait);
+  if (m == MATCH_ERROR)
+    goto cleanup;
+  if (m == MATCH_NO)
+    {
+      m = gfc_match_expr (&wait->unit);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+    }
+
+  for (;;)
+    {
+      if (gfc_match_char (')') == MATCH_YES)
+	break;
+      if (gfc_match_char (',') != MATCH_YES)
+	goto syntax;
+
+      m = match_wait_element (wait);
+      if (m == MATCH_ERROR)
+	goto cleanup;
+      if (m == MATCH_NO)
+	goto syntax;
+    }
+
+  if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: WAIT at %C "
+	  "not allowed in Fortran 95") == FAILURE)
+    goto cleanup;
+
+  if (gfc_pure (NULL))
+    {
+      gfc_error ("WAIT statement not allowed in PURE procedure at %C");
+      goto cleanup;
+    }
+
+  if (gfc_implicit_pure (NULL))
+    gfc_current_ns->proc_name->attr.implicit_pure = 0;
+
+  new_st.op = EXEC_WAIT;
+  new_st.ext.wait = wait;
+
+  return MATCH_YES;
+
+syntax:
+  gfc_syntax_error (ST_WAIT);
+
+cleanup:
+  gfc_free_wait (wait);
+  return MATCH_ERROR;
+}