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https://github.com/rust-lang/rust
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22 lines
375 B
Rust
22 lines
375 B
Rust
//@ run-pass
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macro_rules! pat_in {
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($p:pat in $e:expr) => {{
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let mut iter = $e.into_iter();
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while let $p = iter.next() {}
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}};
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}
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macro_rules! pat_if {
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($p:pat if $e:expr) => {{
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match Some(1u8) {
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$p if $e => {}
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_ => {}
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}
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}};
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}
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fn main() {
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pat_in!(Some(_) in 0..10);
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pat_if!(Some(x) if x > 0);
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}
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