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Push `ast::{ItemKind, ImplItemKind}::OpaqueTy` hack down into lowering
We currently have a hack in the form of `ast::{ItemKind, ImplItemKind}::OpaqueTy` which is constructed literally when you write `type Alias = impl Trait;` but not e.g. `type Alias = Vec<impl Trait>;`. Per rust-lang/rfcs#2515, this needs to change to allow `impl Trait` in nested positions. This PR achieves this change for the syntactic aspect but not the semantic one, which will require changes in lowering and def collection. In the interim, `TyKind::opaque_top_hack` is introduced to avoid knock-on changes in lowering, collection, and resolve. These hacks can then be removed and fixed one by one until the desired semantics are supported.
r? @varkor
Add a regression test for rust-lang#62524 Closes rust-lang#62524
Correct `const_in_array_repeat_expressions` feature name Fixes rust-lang#66433 r? @estebank
… r=Mark-Simulacrum Port erased cleanup Just realised that the changes I made in rust-lang#65965 were removed after the move of all error codes so here it is. I made them into separate commits to make the history look better this time. r? @Mark-Simulacrum
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@bors r+ p=4 rollup=never |
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📌 Commit 0f2f03f has been approved by |
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☀️ Test successful - checks-azure |
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Successful merges:
ast::{ItemKind, ImplItemKind}::OpaqueTyhack down into lowering #66197 (Pushast::{ItemKind, ImplItemKind}::OpaqueTyhack down into lowering)const_in_array_repeat_expressionsfeature name #66435 (Correctconst_in_array_repeat_expressionsfeature name)Failed merges:
r? @ghost