--- a/src/HOL/BNF_Examples/Derivation_Trees/Gram_Lang.thy Mon Jan 20 18:24:56 2014 +0100
+++ b/src/HOL/BNF_Examples/Derivation_Trees/Gram_Lang.thy Mon Jan 20 18:24:56 2014 +0100
@@ -8,7 +8,7 @@
header {* Language of a Grammar *}
theory Gram_Lang
-imports DTree
+imports DTree "~~/src/HOL/Library/Infinite_Set"
begin
--- a/src/HOL/BNF_Examples/Derivation_Trees/Prelim.thy Mon Jan 20 18:24:56 2014 +0100
+++ b/src/HOL/BNF_Examples/Derivation_Trees/Prelim.thy Mon Jan 20 18:24:56 2014 +0100
@@ -8,7 +8,7 @@
header {* Preliminaries *}
theory Prelim
-imports "../../BNF" "../../More_BNFs"
+imports "../../BNF/More_BNFs"
begin
declare fset_to_fset[simp]