25 lines
620 B
Rust
25 lines
620 B
Rust
//@ check-pass
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#![feature(negative_impls)]
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#![feature(with_negative_coherence)]
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//@ aux-build: foreign_trait.rs
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// Test that we cannot implement `LocalTrait` for `String`,
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// even though there is a `String: !ForeignTrait` impl.
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//
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// This may not be the behavior we want long term, but it's the
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// current semantics that we implemented so as to land `!Foo` impls
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// quickly. See internals thread:
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//
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// https://internals.rust-lang.org/t/foo/11587/
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extern crate foreign_trait;
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use foreign_trait::ForeignTrait;
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trait LocalTrait {}
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impl<T: ForeignTrait> LocalTrait for T {}
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impl LocalTrait for String {}
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fn main() {}
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