| changeset 67965 | aaa31cd0caef |
| parent 63411 | e051eea34990 |
| child 68413 | b56ed5010e69 |
--- a/src/HOL/Data_Structures/Lookup2.thy Sun Apr 08 09:46:33 2018 +0200 +++ b/src/HOL/Data_Structures/Lookup2.thy Sun Apr 08 11:05:52 2018 +0200 @@ -6,7 +6,7 @@ imports Tree2 Cmp - Map_by_Ordered + Map_Specs begin fun lookup :: "('a::linorder * 'b, 'c) tree \<Rightarrow> 'a \<Rightarrow> 'b option" where