src/test/ui/lint/semicolon-in-expressions-from-macros/semicolon-in-expressions-from-macros.rs

   1 // check-pass
   2 // edition:2018
   3 #![feature(stmt_expr_attributes)]
   4 #![warn(semicolon_in_expressions_from_macros)]
   5
   6 #[allow(dead_code)]
   7 macro_rules! foo {
   8     ($val:ident) => {
   9         true; //~  WARN trailing semicolon in macro
  10               //~| WARN this was previously accepted
  11               //~| WARN trailing semicolon in macro
  12               //~| WARN this was previously accepted
  13               //~| WARN trailing semicolon in macro
  14               //~| WARN this was previously accepted
  15     }
  16 }
  17
  18 #[allow(semicolon_in_expressions_from_macros)]
  19 async fn bar() {
  20     foo!(first);
  21 }
  22
  23 fn main() {
  24     #[allow(semicolon_in_expressions_from_macros)]
  25     let _ = {
  26         foo!(first)
  27     };
  28
  29     #[allow(semicolon_in_expressions_from_macros)]
  30     let _ = foo!(second);
  31
  32     #[allow(semicolon_in_expressions_from_macros)]
  33     fn inner() {
  34         let _ = foo!(third);
  35     }
  36
  37     #[allow(semicolon_in_expressions_from_macros)]
  38     async {
  39         let _ = foo!(fourth);
  40     };
  41
  42     let _ = {
  43         foo!(warn_in_block)
  44     };
  45
  46     let _ = foo!(warn_in_expr);
  47
  48     // This `#[allow]` does not work, since the attribute gets dropped
  49     // when we expand the macro
  50     let _ = #[allow(semicolon_in_expressions_from_macros)] foo!(allow_does_not_work);
  51 }