19 lines
454 B
Rust
19 lines
454 B
Rust
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macro_rules! overly_complicated (
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($fnname:ident, $arg:ident, $ty:ty, $body:block, $val:expr, $pat:pat, $res:path) =>
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{
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fn $fnname($arg: $ty) -> Option<$ty> $body
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match $fnname($val) {
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Some($pat) => {
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$res
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}
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_ => { fail; }
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}
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}
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)
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fn main() {
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assert overly_complicated!(f, x, Option<uint>, { return Some(x); },
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Some(8u), Some(y), y) == 8u
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} |