Regression: "no method found" error when calling same method twice, with HRTB impl #37154
Description
The following code (playground link) results in a method resolution error on the second call to x.method(). It compiles successfully if x.method() is called only once:
trait Foo {
fn method(&self) {}
}
struct Wrapper<T>(T);
impl<T> Foo for Wrapper<T> where for<'a> &'a T: IntoIterator<Item=&'a ()> {}
fn f(x: Wrapper<Vec<()>>) {
x.method(); // This works.
x.method(); // error: no method named `method`
}The error is:
error: no method named `method` found for type `Wrapper<std::vec::Vec<()>>` in the current scope
--> <anon>:11:7
|
11 | x.method(); // error: no method named `method`
| ^^^^^^
|
= help: items from traits can only be used if the trait is implemented and in scope; the following trait defines an item `method`, perhaps you need to implement it:
= help: candidate #1: `Foo`
@jonas-schievink suggested this might be a bug in the projection cache or some other cache.
This is a regression from Rust 1.10.0-stable to 1.11.0-stable.