rust/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/spec-effectvar-ice.rs

//@ check-fail
// Fixes #119830

#![feature(effects)]
#![feature(min_specialization)]
#![feature(const_trait_impl)]

trait Specialize {}

trait Foo {}

impl<T> const Foo for T {}
//~^ error: const `impl` for trait `Foo` which is not marked with `#[const_trait]`
//~| error: the const parameter `host` is not constrained by the impl trait, self type, or predicates [E0207]

impl<T> const Foo for T where T: const Specialize {}
//~^ error: const `impl` for trait `Foo` which is not marked with `#[const_trait]`
//~| error: `const` can only be applied to `#[const_trait]` traits
//~| error: the const parameter `host` is not constrained by the impl trait, self type, or predicates [E0207]
//~| error: conflicting implementations of trait `Foo`

fn main() {}