autofree: make optional methods work

vlib/v/gen/fn.v

@@ -419,6 +419,7 @@ fn (mut g Gen) method_call(node ast.CallExpr) {
 			}
 		}
 	}
+	g.generate_tmp_autofree_arg_vars(node, name)
 	// if node.receiver_type != 0 {
 	// g.write('/*${g.typ(node.receiver_type)}*/')
 	// g.write('/*expr_type=${g.typ(node.left_type)} rec type=${g.typ(node.receiver_type)}*/')

vlib/v/tests/valgrind/1.strings_and_arrays.v

@@ -79,13 +79,11 @@ fn optional_str() {
 	}
 	println(pos2 + 1)
 	// optional method args must be freed
-	/*
 	pos := s.index('query: $q') or {
 		println('exiting')
 		return
 	}
 	println(pos + 1)
-	*/
 }
 
 fn main() {