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src/Pure/Syntax/syntax.ML
changeset 28375 c879d88d038a
parent 27889 c9e8a5bda32b
child 28407 f9db1da584ac 
--- a/src/Pure/Syntax/syntax.ML	Fri Sep 26 17:24:15 2008 +0200
+++ b/src/Pure/Syntax/syntax.ML	Fri Sep 26 19:07:56 2008 +0200
@@ -405,7 +405,7 @@
 fun pretty_gram (Syntax (tabs, _)) =
   let
     val {lexicon, prmodes, gram, prtabs, ...} = tabs;
-    val prmodes' = sort_strings (filter_out (equal "") prmodes);
+    val prmodes' = sort_strings (filter_out (fn s => s = "") prmodes);
   in
     [pretty_strs_qs "lexicon:" (Scan.dest_lexicon lexicon),
       Pretty.big_list "prods:" (Parser.pretty_gram gram),
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