42 lines
892 B
Rust
42 lines
892 B
Rust
// Regression test for soundness issue #114061:
|
|
// "Coherence incorrectly considers `unnormalizable_projection: Trait` to not hold even if it could"
|
|
#![crate_type = "lib"]
|
|
|
|
pub trait WhereBound {}
|
|
impl WhereBound for () {}
|
|
|
|
pub trait WithAssoc<'a> {
|
|
type Assoc;
|
|
}
|
|
|
|
// These two impls of `Trait` overlap:
|
|
|
|
pub trait Trait {}
|
|
impl<T> Trait for T
|
|
where
|
|
T: 'static,
|
|
for<'a> T: WithAssoc<'a>,
|
|
for<'a> Box<<T as WithAssoc<'a>>::Assoc>: WhereBound,
|
|
{
|
|
}
|
|
|
|
impl<T> Trait for Box<T> {} //~ ERROR conflicting implementations of trait `Trait` for type `Box<_>`
|
|
|
|
// A downstream crate could write:
|
|
//
|
|
//
|
|
// use upstream::*;
|
|
//
|
|
// struct Local;
|
|
// impl WithAssoc<'_> for Box<Local> {
|
|
// type Assoc = Local;
|
|
// }
|
|
//
|
|
// impl WhereBound for Box<Local> {}
|
|
//
|
|
// fn impls_trait<T: Trait>() {}
|
|
//
|
|
// fn main() {
|
|
// impls_trait::<Box<Local>>();
|
|
// }
|