ci fix

vlib/v/checker/checker.v

@@ -3083,18 +3083,19 @@ fn (mut c Checker) cast_expr(mut node ast.CastExpr) ast.Type {
 			tt := c.table.type_to_str(to_type)
 			c.error('cannot cast `${ft}` to `${tt}`', node.pos)
 		} else if to_sym_info.variants.len != to_sym_info.get_deduplicated_variants().len {
-			mut msg := ?string(none)
+			// not a option type because of autofree bug; see https://github.com/vlang/v/actions/runs/8116684464/job/22187255774?pr=20936
+			mut msg := ''
 			print_notice := to_sym_info.attrs.any(!it.has_arg && it.name == 'notice_if_duplicate')
 			for attr in to_sym_info.attrs {
 				if attr.name == 'on_duplicate' && attr.has_arg {
 					msg = attr.arg
 				}
 			}
-			if s := msg {
+			if msg.len > 0 {
 				if print_notice {
-					c.note('duplicate type: ${s}', node.pos)
+					c.note('duplicate type: ${msg}', node.pos)
 				} else {
-					c.error('duplicate type: ${s}', node.pos)
+					c.error('duplicate type: ${msg}', node.pos)
 				}
 			}
 		}

vlib/v/checker/tests/notice_or_error_on_duplicate_using_generic.out

@@ -1,12 +1,12 @@
 vlib/v/checker/tests/notice_or_error_on_duplicate_using_generic.vv:9:7: notice: duplicate type: blah blah blah 11111
-    7 |                            
+    7 |
     8 | fn main() {
-    9 |     _ := Name1[int](123)          
-      |          ~~~~~~~~~~~~~~~   
+    9 |     _ := Name1[int](123)
+      |          ~~~~~~~~~~~~~~~
    10 |     _ := Name2[int](456)
-   11 | }     
+   11 | }
 vlib/v/checker/tests/notice_or_error_on_duplicate_using_generic.vv:10:7: error: duplicate type: blah blah blah 22222
-    8 | fn main() {        
+    8 | fn main() {
     9 |     _ := Name1[int](123)
    10 |     _ := Name2[int](456)
       |          ~~~~~~~~~~~~~~~