// run-pass | |
macro_rules! pat_in { | |
($p:pat in $e:expr) => {{ | |
let mut iter = $e.into_iter(); | |
while let $p = iter.next() {} | |
}} | |
} | |
macro_rules! pat_if { | |
($p:pat if $e:expr) => {{ | |
match Some(1u8) { | |
$p if $e => {}, | |
_ => {} | |
} | |
}} | |
} | |
macro_rules! pat_bar { | |
($p:pat | $p2:pat) => {{ | |
match Some(1u8) { | |
$p | $p2 => {}, | |
_ => {} | |
} | |
}} | |
} | |
fn main() { | |
pat_in!(Some(_) in 0..10); | |
pat_if!(Some(x) if x > 0); | |
pat_bar!(Some(1u8) | None); | |
} |