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src/HOL/SPARK/SPARK.thy
changeset 71954 13bb3f5cdc5b
parent 70185 ac1706cdde25
child 72488 ee659bca8955 
--- a/src/HOL/SPARK/SPARK.thy	Thu Jun 18 09:07:30 2020 +0000
+++ b/src/HOL/SPARK/SPARK.thy	Thu Jun 18 09:07:30 2020 +0000
@@ -37,7 +37,7 @@
   XOR_upper [of _ 64, simplified]
 
 lemma bit_not_spark_eq:
-  "NOT (word_of_int x :: ('a::len0) word) =
+  "NOT (word_of_int x :: ('a::len) word) =
   word_of_int (2 ^ LENGTH('a) - 1 - x)"
 proof -
   have "word_of_int x + NOT (word_of_int x) =
isabelle