177e7ff548
When `#![feature(min_generic_const_args)]` is enabled, we now lower all const paths in generic arg position to `hir::ConstArgKind::Path`. We then lower assoc const paths to `ty::ConstKind::Unevaluated` since we can no longer use the anon const expression lowering machinery. In the process of implementing this, I factored out `hir_ty_lowering` code that is now shared between lowering assoc types and assoc consts. This PR also introduces a `#[type_const]` attribute for trait assoc consts that are allowed as const args. However, we still need to implement code to check that assoc const definitions satisfy `#[type_const]` if present (basically is it a const path or a monomorphic anon const). |
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