src/test/ui/for-loop-while/label_break_value_invalid.rs

   1 #![crate_type = "lib"]
   2 #![feature(label_break_value)]
   3
   4 fn lbv_macro_test_hygiene_respected() {
   5     macro_rules! mac2 {
   6         ($val:expr) => {
   7             break 'a $val; //~ ERROR undeclared label `'a` [E0426]
   8         };
   9     }
  10     let x: u8 = 'a: {
  11         'b: {
  12             if true {
  13                 mac2!(2);
  14             }
  15         };
  16         0
  17     };
  18     assert_eq!(x, 2);
  19
  20     macro_rules! mac3 {
  21         ($val:expr) => {
  22             'a: {
  23                 $val
  24             }
  25         };
  26     }
  27     let x: u8 = mac3!('b: {
  28         if true {
  29             break 'a 3; //~ ERROR undeclared label `'a` [E0426]
  30         }
  31         0
  32     });
  33     assert_eq!(x, 3);
  34     let x: u8 = mac3!(break 'a 4); //~ ERROR undeclared label `'a` [E0426]
  35     assert_eq!(x, 4);
  36 }