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src/HOL/Library/More_List.thy
changeset 67399 eab6ce8368fa
parent 65388 a8d868477bc0
child 67730 f91c437f6f68 
--- a/src/HOL/Library/More_List.thy	Wed Jan 10 15:21:49 2018 +0100
+++ b/src/HOL/Library/More_List.thy	Wed Jan 10 15:25:09 2018 +0100
@@ -320,7 +320,7 @@
     (simp add: strip_while_def length_dropWhile_le del: length_rev)
 
 lemma nth_default_strip_while_dflt [simp]:
-  "nth_default dflt (strip_while (op = dflt) xs) = nth_default dflt xs"
+  "nth_default dflt (strip_while ((=) dflt) xs) = nth_default dflt xs"
   by (induct xs rule: rev_induct) auto
 
 lemma nth_default_eq_iff:
isabelle