macro_rules! arm { | |
($pattern:pat => $block:block) => { | |
$pattern => $block | |
}; | |
} | |
fn main() { | |
let x = Some(1); | |
match x { | |
Some(1) => {}, | |
arm!(None => {}), | |
//~^ NOTE macros cannot expand to match arms | |
//~| ERROR unexpected `,` in pattern | |
// doesn't recover | |
Some(2) => {}, | |
_ => {}, | |
}; | |
} |