Co-authored-by: Bastian Kauschke <bastian_kauschke@hotmail.de>

Emit an error when incompatible sanitizer are configured through command
line options. Previously the last one configured prevailed and others
were silently ignored.

Additionally use a set to represent configured sanitizers, making it
possible to enable multiple sanitizers at once. At least in principle,
since currently all of them are considered to be incompatible with
others.

It does the same thing as `Deref` now

The `Call` terminator only works with `FnDef` and `FnPtr` types.
It happened to work with `Self` so far because it was always
substituted with the real type before being used.

No one actually works with src/tools/librustdoc, it's almost empty.

This is required to avoid cycles when evaluating auto trait
predicates.

This commit modifies the pretty printer and const eval in the MIR so
that `destructure_const` (used in `pretty_print_const_value`) can handle
enums with no variants (or types containing enums with no variants).

Signed-off-by: David Wood <david@davidtw.co>

The `E` type parameter was unnecessary, so it's now removed. The folding
closure now has reduced parametricity on just `T = Self::Item`, rather
than the whole `Self` iterator type. There's otherwise no functional
change in this.

… r=matthewjasper

Specialization is unsound

As discussed in rust-lang#31844 (comment), it might be a good idea to warn users of specialization that the feature they are using is unsound.

I also expanded the "incomplete feature" warning to link the user to the tracking issue.

Refactor `try_find` a little

~~This works like `find_map`, but mapping to a `Try` type. It stops when `Ok` is `Some(value)`, with an additional short-circuit on `Try::Error`. This is similar to the unstable `try_find`, but has the advantage of being able to directly return the user's `R: Try` type directly, rather than converting to `Result`.~~
(removed -- `try_find_map` was declined in review)

This PR also refactors `try_find` a little to match style. The `E` type parameter was unnecessary, so it's now removed. The folding closure now has reduced parametricity on just `T = Self::Item`, rather
than the whole `Self` iterator type. There's otherwise no functional change in this.

add str to common types

I already expected this to be the case and it may slightly improve perf.

Afaict if we ever want to change str into a lang item this would have to get reverted.
As that would be fairly simple I don't believe this to cause any problems in the future.

update coerce docs and unify relevant tests

Merges `test/ui/coerce` with `test/ui/coercion`.
Updates the documentation of `librustc_typeck/check/coercion.rs`.
Adds 2 new coercion tests.

…ts, r=oli-obk

forbid mutable references in all constant contexts except for const-fns

PR to address rust-lang#71212

cc: @ecstatic-morse

Make `need_type_info_err` more conservative

Makes sure arg patterns we are going to suggest on are actually contained within the span of the obligation that caused the inference error (credit to @lcnr for suggesting this fix).

There's a subtle trade-off regarding the handling of local patterns which I've left a comment about.

Resolves rust-lang#72690

…nikic

Diagnose use of incompatible sanitizers

Emit an error when incompatible sanitizer are configured through command
line options. Previously the last one configured prevailed and others
were silently ignored.

Additionally use a set to represent configured sanitizers, making it
possible to enable multiple sanitizers at once. At least in principle,
since currently all of them are considered to be incompatible with
others.

…tthewjasper

shim.rs: avoid creating `Call` terminators calling `Self`

Also contains some cleanup and doc comment additions so I could make sense of the code.

Fixes rust-lang#73109
Closes rust-lang#73175

r? @matthewjasper

…an-DPC

Clean up E0668 explanation

r? @Dylan-DPC

…an-DPC

Clean up E0670 explanation

r? @Dylan-DPC

…ark-Simulacrum

Add src/librustdoc as an alias for src/tools/rustdoc

No one actually works with src/tools/rustdoc, it's almost empty.

Closes rust-lang#73439

…const-val-enum-no-variants, r=oli-obk

pretty/mir: const value enums with no variants

Fixes rust-lang#72181.

This PR modifies the pretty printer and const eval in the MIR so that `destructure_const` (used in `pretty_print_const_value`) can handle enums with no variants (or types containing enums with no variants).

I'm not convinced that this is the correct approach, folks more familiar with `destructure_const` would be able to say - happy to adjust the PR. Looking through `destructure_const` and the functions that it invokes, it didn't seem like it was written to handle zero-variant-enums - I assume that case is handled earlier in some way so `destructure_const` doesn't need to under normal circumstances. It didn't seem like it would be straightforward to make `destructure_const` handle this case in a first-class-feeling way (e.g. adding a `Variants::None` variant), so this PR makes some minimal changes to avoid ICEs.

Unify region variables when projecting associated types

This is required to avoid cycles when evaluating auto trait predicates.
Notably, this is required to be able add Chalk types to `CtxtInterners` for `cfg(parallel_compiler)`.

r? @nikomatsakis

Use alloc::Layout in DroplessArena API

…ckler

Update the doc for std::prelude to the correct behavior

Fixes rust-lang#64686.

One line change to ensure the docs are correct about the behavior of the compiler when inserting`std::prelude::v1`.

I don't think examples are necessary but I can add some (especially those from the original issue) if needed.

Bump Rustfmt and RLS

Fixes rust-lang#73406
Fixes rust-lang#73199
Fixes rust-lang#73407
Fixes rust-lang#73200

cc @calebcartwright @topecongiro

r? @ghost

Let's see what CI says first