diff -r b2d8d50b9efb -r a7774e1e1f1b src/Pure/Tools/adhoc_overloading.ML
--- a/src/Pure/Tools/adhoc_overloading.ML	Tue Jan 28 13:35:08 2025 +0100
+++ b/src/Pure/Tools/adhoc_overloading.ML	Tue Jan 28 13:37:02 2025 +0100
@@ -202,7 +202,7 @@
   else map (fn t => Term.map_aterms (insert_variants ctxt t) t);
 
 fun uncheck ctxt ts =
-  if Config.get ctxt show_variants orelse exists (is_none o try Term.type_of) ts then ts
+  if Config.get ctxt show_variants orelse exists (not o can Term.type_of) ts then ts
   else map (insert_overloaded ctxt) ts;
 
 fun reject_unresolved ctxt =