rust/tests/ui/pattern/rfc-3637-guard-patterns/macro-rules.rs

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2024-12-07 11:49:08 +00:00
//@ run-pass
//! Tests that the addition of guard patterns does not change the behavior of the `pat` macro
//! fragment.
#![feature(guard_patterns)]
#![allow(incomplete_features)]
macro_rules! has_guard {
($p:pat) => {
false
};
($p:pat if $e:expr) => {
true
};
}
fn main() {
assert_eq!(has_guard!(Some(_)), false);
assert_eq!(has_guard!(Some(_) if true), true);
assert_eq!(has_guard!((Some(_) if true)), false);
}