src/test/run-pass/macros/macro-interpolation.rs

   1 // run-pass
   2
   3 macro_rules! overly_complicated {
   4     ($fnname:ident, $arg:ident, $ty:ty, $body:block, $val:expr, $pat:pat, $res:path) =>
   5     ({
   6         fn $fnname($arg: $ty) -> Option<$ty> $body
   7         match $fnname($val) {
   8           Some($pat) => {
   9             $res
  10           }
  11           _ => { panic!(); }
  12         }
  13     })
  14
  15 }
  16
  17 pub fn main() {
  18     assert!(overly_complicated!(f, x, Option<usize>, { return Some(x); },
  19                                Some(8), Some(y), y) == 8)
  20
  21 }