1 files changed, 51 insertions, 0 deletions
diff --git a/gcc/testsuite/gfortran.dg/operator_5.f90 b/gcc/testsuite/gfortran.dg/operator_5.f90
new file mode 100644
index 000000000..6ce77c8dc
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/operator_5.f90
@@ -0,0 +1,51 @@
+! { dg-do compile }
+! { dg-options "-c" }
+
+MODULE mod_t
+  type :: t
+    integer :: x
+  end type
+
+  ! user defined operator
+  INTERFACE OPERATOR(.FOO.)
+    MODULE PROCEDURE t_foo
+  END INTERFACE
+
+  INTERFACE OPERATOR(.FOO.)
+    MODULE PROCEDURE t_foo                  ! { dg-error "already present" }
+  END INTERFACE
+
+  INTERFACE OPERATOR(.FOO.)
+    MODULE PROCEDURE t_bar                  ! { dg-error "Ambiguous interfaces" }
+  END INTERFACE
+
+  ! intrinsic operator
+  INTERFACE OPERATOR(==)
+    MODULE PROCEDURE t_foo
+  END INTERFACE
+
+  INTERFACE OPERATOR(.eq.)
+    MODULE PROCEDURE t_foo                  ! { dg-error "already present" }
+  END INTERFACE
+
+  INTERFACE OPERATOR(==)
+    MODULE PROCEDURE t_bar                  ! { dg-error "Ambiguous interfaces" }
+  END INTERFACE
+
+  INTERFACE OPERATOR(.eq.)
+    MODULE PROCEDURE t_bar                  ! { dg-error "already present" }
+  END INTERFACE
+
+CONTAINS
+  LOGICAL FUNCTION t_foo(this, other)
+    TYPE(t), INTENT(in) :: this, other
+    t_foo = .FALSE.
+  END FUNCTION
+
+  LOGICAL FUNCTION t_bar(this, other)
+    TYPE(t), INTENT(in) :: this, other
+    t_bar = .FALSE.
+  END FUNCTION
+END MODULE
+
+! { dg-final { cleanup-modules "mod_t" } }