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src/Pure/General/symbol.scala
changeset 50238 98d35a7368bd
parent 50233 eef21a0726f1
child 50291 674893679352 
--- a/src/Pure/General/symbol.scala	Mon Nov 26 20:58:41 2012 +0100
+++ b/src/Pure/General/symbol.scala	Mon Nov 26 21:10:42 2012 +0100
@@ -26,7 +26,7 @@
     is_ascii_letter(c) || is_ascii_digit(c) || is_ascii_quasi(c)
 
   def is_ascii_identifier(s: String): Boolean =
-    s.length > 0 && is_ascii_letter(s(0)) && s.substring(1).forall(is_ascii_letdig)
+    s.length > 0 && is_ascii_letter(s(0)) && s.forall(is_ascii_letdig)
 
 
   /* symbol matching */
isabelle