--- a/thys3/LexerSimp.thy Fri May 26 08:09:30 2023 +0100
+++ b/thys3/LexerSimp.thy Fri May 26 08:10:17 2023 +0100
@@ -2,7 +2,7 @@
imports "Lexer"
begin
-section {* Lexer including some simplifications *}
+section \<open>Lexer including some simplifications\<close>
fun F_RIGHT where