Fix correct ? after optional function name when reporting type errors.

releasenotes.md

@@ -72,6 +72,7 @@
 - Inlining a const as an lvalue would take the wrong path and corrupt the expression node.
 - Grabbing (missing) methods on function pointers would cause crash #2434.
 - Fix alignment on jump table.
+- Fix correct `?` after optional function name when reporting type errors.
 
 ### Stdlib changes
 - Add `==` to `Pair`, `Triple` and TzDateTime. Add print to `Pair` and `Triple`.

src/compiler/types.c

@@ -138,7 +138,7 @@ void type_append_name_to_scratch(Type *type)
 			{
 				scratch_buffer_append("void");
 			}
-			scratch_buffer_append_char('!');
+			scratch_buffer_append_char('?');
 			break;
 		case TYPE_SLICE:
 			type_append_name_to_scratch(type->array.base);