--- a/src/HOL/Library/RBT.thy Thu Jun 26 10:06:54 2008 +0200 +++ b/src/HOL/Library/RBT.thy Thu Jun 26 10:07:01 2008 +0200 @@ -8,7 +8,7 @@ (*<*) theory RBT -imports Main AssocList +imports Plain AssocList begin datatype color = R | B