diff -r 023d92df3d84 -r ed6b100a9c7d src/Pure/Pure.thy
--- a/src/Pure/Pure.thy	Wed Dec 19 21:38:57 2018 +0100
+++ b/src/Pure/Pure.thy	Thu Dec 20 12:40:24 2018 +0000
@@ -7,7 +7,7 @@
 theory Pure
 keywords
     "!!" "!" "+" ":" ";" "<" "<=" "==" "=>" "?" "[" "\<comment>" "\<equiv>" "\<leftharpoondown>" "\<rightharpoonup>" "\<rightleftharpoons>"
-    "\<subseteq>" "]" "attach" "binder" "in" "infix" "infixl" "infixr" "is" "open" "output"
+    "\<subseteq>" "]" "binder" "in" "infix" "infixl" "infixr" "is" "open" "output"
     "overloaded" "pervasive" "premises" "structure" "unchecked"
   and "private" "qualified" :: before_command
   and "assumes" "constrains" "defines" "fixes" "for" "if" "includes" "notes" "rewrites"