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macro_rules! arm {
($pattern:pat => $block:block) => {
$pattern => $block
//~^ ERROR macro expansion ignores token `=>` and any following
//~| NOTE the usage of `arm!` is likely invalid in pattern context
//~| NOTE macros cannot expand to match arms
};
}
fn main() {
let x = Some(1);
match x {
Some(1) => {},
arm!(None => {}),
//~^ NOTE caused by the macro expansion here
//~| ERROR `match` arm with no body
Some(2) => {},
_ => {},
};
}
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