diff -r 6623c81cb15a -r 634cd44bb1d3 src/Pure/Pure.thy
--- a/src/Pure/Pure.thy	Wed Nov 04 23:27:00 2015 +0100
+++ b/src/Pure/Pure.thy	Thu Nov 05 00:02:30 2015 +0100
@@ -6,7 +6,7 @@
 
 theory Pure
   keywords
-    "!!" "!" "+" "--" ":" ";" "<" "<=" "=" "=>" "?" "[" "\<equiv>"
+    "!!" "!" "+" "--" ":" ";" "<" "<=" "=" "=>" "?" "[" "\<comment>" "\<equiv>"
     "\<leftharpoondown>" "\<rightharpoonup>" "\<rightleftharpoons>"
     "\<subseteq>" "]" "assumes" "attach" "binder" "constrains"
     "defines" "fixes" "for" "identifier" "if" "in" "includes" "infix"