--- a/src/HOL/Extraction/Pigeonhole.thy Thu Jul 19 21:47:38 2007 +0200
+++ b/src/HOL/Extraction/Pigeonhole.thy Thu Jul 19 21:47:39 2007 +0200
@@ -6,7 +6,7 @@
header {* The pigeonhole principle *}
theory Pigeonhole
-imports EfficientNat
+imports Efficient_Nat
begin
text {*