--- a/src/HOL/Isar_Examples/Peirce.thy Tue Aug 02 18:45:34 2016 +0200
+++ b/src/HOL/Isar_Examples/Peirce.thy Tue Aug 02 18:46:24 2016 +0200
@@ -5,7 +5,7 @@
section \<open>Peirce's Law\<close>
theory Peirce
-imports Main
+ imports Main
begin
text \<open>