--- a/src/Pure/General/symbol.scala Wed Oct 25 14:39:22 2017 +0200
+++ b/src/Pure/General/symbol.scala Wed Oct 25 14:54:28 2017 +0200
@@ -60,6 +60,8 @@
else char_symbols(c.toInt)
}
+ def is_ascii(s: Symbol): Boolean = s.length == 1 && s(0) < 128
+
/* symbol matching */