rust/compiler/rustc_trait_selection/src/traits, branch 1.82.0

Rollup merge of #129767 - nnethercote:rm-extern-crate-tracing-4, r=jieyouxu

2024-08-31T12:46:11+00:00

Remove `#[macro_use] extern crate tracing`, round 4 Because explicit importing of macros via use items is nicer (more standard and readable) than implicit importing via #[macro_use]. Continuing the work from #124511, #124914, and #125434. After this PR no `rustc_*` crates use `#[macro_use] extern crate tracing` except for `rustc_codegen_gcc` which is a special case and I will do separately. r? ```@jieyouxu```

Rollup merge of #129725 - compiler-errors:predicates-of, r=fmease

2024-08-31T08:08:57+00:00

Stop using `ty::GenericPredicates` for non-predicates_of queries `GenericPredicates` is a struct of several parts: A list of of an item's own predicates, and a parent def id (and some effects related stuff, but ignore that since it's kinda irrelevant). When instantiating these generic predicates, it calls `predicates_of` on the parent and instantiates its predicates, and appends the item's own instantiated predicates too: https://github.com/rust-lang/rust/blob/acb4e8b6251f1d8da36f08e7a70fa23fc581839e/compiler/rustc_middle/src/ty/generics.rs#L407-L413 Notice how this should result in a recursive set of calls to `predicates_of`... However, `GenericPredicates` is *also* misused by a bunch of *other* queries as a convenient way of passing around a list of predicates. For these queries, we don't ever set the parent def id of the `GenericPredicates`, but if we did, then this would be very easy to mistakenly call `predicates_of` instead of some other intended parent query. Given that footgun, and the fact that we don't ever even *use* the parent def id in the `GenericPredicates` returned from queries like `explicit_super_predicates_of`, It really has no benefit over just returning `&'tcx [(Clause<'tcx>, Span)]`. This PR additionally opts to wrap the results of `EarlyBinder`, as we've tended to use that in the return type of these kinds of queries to properly convey that the user has params to deal with, and it also gives a convenient way of iterating over a slice of things after instantiating.

Remove `#[macro_use] extern crate tracing` from `rustc_trait_selection`.

2024-08-30T07:14:59+00:00

Stop using ty::GenericPredicates for non-predicates_of queries

2024-08-29T04:17:40+00:00

Implement RFC 3525.

2024-08-28T07:54:23+00:00

Simplify some redundant field names

2024-08-21T05:31:42+00:00

Rollup merge of #129217 - jswrenn:transmute-lifetimes, r=compiler-errors

2024-08-19T18:14:56+00:00

safe transmute: check lifetimes Modifies `BikeshedIntrinsicFrom` to forbid lifetime extensions on references. This static check can be opted out of with the `Assume::lifetimes` flag. Fixes #129097 Tracking Issue: https://github.com/rust-lang/rust/issues/99571 r? `@compiler-errors`

safe transmute: forbid reference lifetime extension

2024-08-18T18:31:06+00:00

Modifies `BikeshedIntrinsicFrom` to forbid lifetime extensions on references. This static check can be opted out of with the `Assume::lifetimes` flag. Fixes #129097

Fix order of normalization and recursion in const folding.

2024-08-17T22:07:41+00:00

Fixes #126831. Without this patch, type normalization is not always idempotent, which leads to all sorts of bugs in places that assume that normalizing a normalized type does nothing.

Rollup merge of #129078 - lcnr:scrape_region_constraints-use-ocx, r=compiler-errors

2024-08-16T01:44:18+00:00

`ParamEnvAnd::fully_perform`: we have an `ocx`, use it cc #123669 r? ``@compiler-errors``