Auto merge of #66246 - matthewjasper:simplify-mem-cat, r=pnkfelix

Simplify memory categorization

With AST borrowck gone, mem_categorization can be simplified, a lot.

* `cmt_` is now called `Place`. Most local variable names have been updated to reflect this, but the `cat_*` methods retain their names.
* `MemCategorizationContext` no longer needs a `ScopeTree` and always needs an `InferCtxt`.
* `Place` now uses a similar representation to `mir::Place` with a `Vec` of projections.
* `Upvar` places don't include the implicit environment and capture derefs. These are now handled by `regionck` when needed.
* Various types, methods and variants only used by AST borrowck have been removed.
* `ExprUseVisitor` now lives in `rustc_typeck::expr_use_visitor`.
* `MemCategorizationContext` and `Place` live in `rustc_typeck::mem_categorization`.
* `Place` is re-exported in `rustc_typeck::expr_use_visitor` so that Clippy can access it.

The loss of an error in `issue-4335.rs` is due to a change in capture inference in ill-formed programs. If any projection from a variable is moved from then we capture that variable by move, whether or not the place being moved from allows this.

Closes #66270

Author: bors

src/librustc/lib.rs

@@ -96,15 +96,13 @@ pub mod infer;
 pub mod lint;
 
 pub mod middle {
-    pub mod expr_use_visitor;
     pub mod cstore;
     pub mod dependency_format;
     pub mod diagnostic_items;
     pub mod exported_symbols;
     pub mod free_region;
     pub mod lib_features;
     pub mod lang_items;
-    pub mod mem_categorization;
     pub mod privacy;
     pub mod reachable;
     pub mod region;