1 files changed, 13 insertions, 0 deletions
diff --git a/libgo/go/unicode/digit.go b/libgo/go/unicode/digit.go
new file mode 100644
index 000000000..471c4dfdc
--- /dev/null
+++ b/libgo/go/unicode/digit.go
@@ -0,0 +1,13 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unicode
+
+// IsDigit reports whether the rune is a decimal digit.
+func IsDigit(rune int) bool {
+	if rune < 0x100 { // quick ASCII (Latin-1, really) check
+		return '0' <= rune && rune <= '9'
+	}
+	return Is(Digit, rune)
+}