diff -r 9a29e883a934 -r 1005c50b2750 src/ZF/Constructible/L_axioms.thy
--- a/src/ZF/Constructible/L_axioms.thy	Wed Mar 18 17:29:20 2020 +0100
+++ b/src/ZF/Constructible/L_axioms.thy	Wed Mar 18 17:44:27 2020 +0100
@@ -110,7 +110,7 @@
    apply (rule Union_ax)
   done
 
-interpretation L?: M_trivial L by (rule M_trivial_L)
+interpretation L: M_trivial L by (rule M_trivial_L)
 
 (* Replaces the following declarations...
 lemmas rall_abs = M_trivial.rall_abs [OF M_trivial_L]