43 lines
766 B
Rust
43 lines
766 B
Rust
//@ run-pass
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struct CustomEq;
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impl Eq for CustomEq {}
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impl PartialEq for CustomEq {
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fn eq(&self, _: &Self) -> bool {
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false
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}
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}
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#[derive(PartialEq, Eq)]
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#[allow(unused)]
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enum Foo {
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Bar,
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Baz,
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Qux(CustomEq),
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}
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const BAR_BAZ: Foo = if 42 == 42 {
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Foo::Bar
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} else {
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Foo::Qux(CustomEq) // dead arm
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};
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const EMPTY: &[CustomEq] = &[];
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fn main() {
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// BAR_BAZ itself is fine but the enum has other variants
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// that are non-structural. Still, this should be accepted.
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match Foo::Qux(CustomEq) {
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BAR_BAZ => panic!(),
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_ => {}
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}
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// Similarly, an empty slice of a type that is non-structural
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// is accepted.
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match &[CustomEq] as &[CustomEq] {
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EMPTY => panic!(),
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_ => {},
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}
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}
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