mirror of https://github.com/rust-lang/rust
34 lines
933 B
Rust
34 lines
933 B
Rust
// Ensure that we print unsatisfied always-const trait bounds as `const Trait` in diagnostics.
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#![feature(const_trait_impl, effects, generic_const_exprs)]
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#![allow(incomplete_features)]
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fn require<T: const Trait>() {}
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#[const_trait]
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trait Trait {
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fn make() -> u32;
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}
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struct Ty;
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impl Trait for Ty {
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fn make() -> u32 { 0 }
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}
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fn main() {
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require::<Ty>(); //~ ERROR the trait bound `Ty: const Trait` is not satisfied
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}
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struct Container<const N: u32>;
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// FIXME(effects): Somehow emit `the trait bound `T: const Trait` is not satisfied` here instead
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// and suggest changing `Trait` to `const Trait`.
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fn accept0<T: Trait>(_: Container<{ T::make() }>) {}
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//~^ ERROR mismatched types
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// FIXME(effects): Instead of suggesting `+ const Trait`, suggest
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// changing `~const Trait` to `const Trait`.
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const fn accept1<T: ~const Trait>(_: Container<{ T::make() }>) {}
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//~^ ERROR mismatched types
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