mirror of https://github.com/rust-lang/rust
30 lines
704 B
Rust
30 lines
704 B
Rust
#![feature(generic_const_exprs)]
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#![allow(incomplete_features)]
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// The goal is to get an unevaluated const `ct` with a `Ty::Infer(TyVar(?1t)` subst.
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//
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// If we are then able to infer `ty::Infer(TyVar(?1t) := Ty<ct>` we introduced an
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// artificial inference cycle.
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struct Foo<const N: usize>;
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trait Bind<T> {
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fn bind() -> (T, Self);
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}
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// `N` has to be `ConstKind::Unevaluated`.
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impl<T> Bind<T> for Foo<{ 6 + 1 }> {
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fn bind() -> (T, Self) {
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(panic!(), Foo)
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}
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}
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fn main() {
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let (mut t, foo) = Foo::bind();
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//~^ ERROR mismatched types
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//~| NOTE cyclic type
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// `t` is `ty::Infer(TyVar(?1t))`
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// `foo` contains `ty::Infer(TyVar(?1t))` in its substs
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t = foo;
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}
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