27 lines
708 B
Rust
27 lines
708 B
Rust
// Tests that we cannot assume that an opaque type does *not* implement some
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// other trait
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// revisions: min_tait full_tait
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#![feature(min_type_alias_impl_trait)]
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#![cfg_attr(full_tait, feature(type_alias_impl_trait))]
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//[full_tait]~^ WARN incomplete
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trait OpaqueTrait {}
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impl<T> OpaqueTrait for T {}
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type OpaqueType = impl OpaqueTrait;
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fn mk_opaque() -> OpaqueType {
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()
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}
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#[derive(Debug)]
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struct D<T>(T);
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trait AnotherTrait {}
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impl<T: std::fmt::Debug> AnotherTrait for T {}
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// This is in error, because we cannot assume that `OpaqueType: !Debug`
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impl AnotherTrait for D<OpaqueType> {
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//~^ ERROR conflicting implementations of trait `AnotherTrait` for type `D<impl OpaqueTrait>`
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}
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fn main() {}
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