42 lines
724 B
Rust
42 lines
724 B
Rust
//@ run-pass
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//@ edition:2021
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use Foo::*;
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#[allow(dead_code)]
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#[derive(Eq, PartialEq, Debug)]
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enum Foo {
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A(u64),
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B(u64),
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C,
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D,
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}
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macro_rules! foo {
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($orpat:pat, $val:expr) => {
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match $val {
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x @ ($orpat) => x, // leading vert would not be allowed in $orpat
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_ => B(0xDEADBEEFu64),
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}
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};
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}
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macro_rules! bar {
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($orpat:pat, $val:expr) => {
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match $val {
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$orpat => 42, // leading vert allowed here
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_ => 0xDEADBEEFu64,
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}
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};
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}
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fn main() {
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// Test or-pattern.
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let y = foo!(A(_)|B(_), A(32));
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assert_eq!(y, A(32));
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// Leading vert in or-pattern.
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let y = bar!(|C| D, C);
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assert_eq!(y, 42u64);
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}
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