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https://github.com/rust-lang/rust
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36 lines
871 B
Rust
36 lines
871 B
Rust
//@ revisions: classic coherence next
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//@[next] compile-flags: -Znext-solver
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//@[coherence] compile-flags: -Znext-solver=coherence
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//@[classic] check-pass
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//@[classic] known-bug: #105782
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// Should fail. Default items completely drop candidates instead of ambiguity,
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// which is unsound during coherence, since coherence requires completeness.
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#![feature(specialization)]
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#![allow(incomplete_features)]
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trait Default {
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type Id;
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}
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impl<T> Default for T {
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default type Id = T; //[next]~ ERROR type annotations needed
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}
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trait Overlap {
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type Assoc;
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}
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impl Overlap for u32 {
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type Assoc = usize;
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}
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impl Overlap for <u32 as Default>::Id {
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//[coherence]~^ ERROR conflicting implementations of trait `Overlap` for type `u32`
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//[next]~^^ ERROR conflicting implementations of trait `Overlap` for type `u32`
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type Assoc = Box<usize>;
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}
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fn main() {}
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