src/test/ui/macros/macro-interpolation.rs


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// run-pass

macro_rules! overly_complicated {
    ($fnname:ident, $arg:ident, $ty:ty, $body:block, $val:expr, $pat:pat, $res:path) =>
    ({
        fn $fnname($arg: $ty) -> Option<$ty> $body
        match $fnname($val) {
          Some($pat) => {
            $res
          }
          _ => { panic!(); }
        }
    })

}

pub fn main() {
    assert!(overly_complicated!(f, x, Option<usize>, { return Some(x); },
                               Some(8), Some(y), y) == 8)

}