23 lines
459 B
Rust
23 lines
459 B
Rust
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#![feature(exclusive_range_pattern)]
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#![deny(unreachable_patterns)]
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enum Q { R(Option<usize>) }
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pub fn main() {
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match Q::R(None) {
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Q::R(S) if S.is_some() => {}
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_ => {}
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}
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match 0u8 { //~ ERROR non-exhaustive patterns
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0 .. 128 => {}
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128 ..= 255 if true => {}
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}
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match 0u8 {
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0 .. 128 => {}
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128 ..= 255 if false => {}
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128 ..= 255 => {} // ok, because previous arm was guarded
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}
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}
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