#[macro_export]
macro_rules! matches {
($expression: expr, $($pattern:tt)+) => {
_tt_as_expr_hack! {
match $expression {
$($pattern)+ => true,
_ => false
}
}
}
}
#[macro_export]
macro_rules! _tt_as_expr_hack(
($value:expr) => ($value)
);
#[test]
fn it_works() {
let foo = Some("-12");
assert!(matches!(foo, Some(bar) if
matches!(bar.as_bytes()[0], b'+' | b'-') &&
matches!(bar.as_bytes()[1], b'0'...b'9')
));
}