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 
main()17 pub fn main() {
18     assert!(overly_complicated!(f, x, Option<usize>, { return Some(x); },
19                                Some(8), Some(y), y) == 8)
20 
21 }
22