44 lines
698 B
Rust
44 lines
698 B
Rust
#![feature(rustc_attrs)]
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#[rustc_must_implement_one_of(eq, neq)]
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trait Equal {
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fn eq(&self, other: &Self) -> bool {
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!self.neq(other)
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}
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fn neq(&self, other: &Self) -> bool {
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!self.eq(other)
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}
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}
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struct T0;
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struct T1;
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struct T2;
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struct T3;
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impl Equal for T0 {
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fn eq(&self, _other: &Self) -> bool {
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true
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}
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}
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impl Equal for T1 {
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fn neq(&self, _other: &Self) -> bool {
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false
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}
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}
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impl Equal for T2 {
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fn eq(&self, _other: &Self) -> bool {
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true
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}
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fn neq(&self, _other: &Self) -> bool {
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false
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}
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}
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impl Equal for T3 {}
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//~^ ERROR not all trait items implemented, missing one of: `eq`, `neq`
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fn main() {}
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