Const generics: Bounds like `T: Foo<{ value }>` don't work

[jplatte]

This is probably due to lazy normalization not being here yet, but I don't find any issues for this specifically so maybe this is a good additional test case for #71973 or a later PR?

#![feature(const_generics)]

trait Foo<const B: bool> {}
fn bar<T: Foo<{ true }>>() {}

I wouldn't even expect this to work necessarily, since the equivalent thing with an associated constant instead of a const generic argument produces cannot constrain an associated constant to a value (although without an error code 🙁).

[jplatte]

Ah, nevermind, the linked PR already has a very similar test case. I guess this still tracks an issue until that PR has been merged, but I will close afterwards.

[lcnr]

Its novel enough to be added as an additional test 👍

We still need a lot of tests for const generics if we want to ever make them stable.