Extend the `SizeSkeleton` evaluator to shortcut zero-sized arrays, thus
considering `[T; 0]` to have a compile-time fixed-size of 0.
The existing evaluator already deals with generic arrays under the
feature-guard `transmute_const_generics`. However, it merely allows
comparing fixed-size types with fixed-size types, and generic types with
generic types. For generic types, it merely compares whether their
arguments match (ordering them first). Even if their exact sizes are not
known at compile time, it can ensure that they will eventually be the
same.
This patch extends this by shortcutting the size-evaluation of zero
sized arrays and thus allowing size comparisons of `()` with `[T; 0]`,
where one contains generics and the other does not.
This code is guarded by `transmute_const_generics` (#109929), even
though it is unclear whether it should be. However, this assumes that a
separate stabilization PR is required to move this out of the feature
guard.
Initially reported in #98104.
Rollup of 6 pull requests
Successful merges:
- #121543 (various clippy fixes)
- #122540 (Do not use `?`-induced skewing of type inference in the compiler)
- #122730 (Expose `ucred::peer_cred` on QNX targets to enable dist builds)
- #122732 (Remove redundant coroutine captures note)
- #122739 (Add "put" as a confusable for insert on hash map/set)
- #122748 (Reduce `pub` usage in `rustc_session`.)
r? `@ghost`
`@rustbot` modify labels: rollup
These assertions detect situations where a BCB node would have both a physical
counter and one or more in-edge counters/expressions.
For most BCBs that situation would indicate an implementation bug. However,
it's perfectly fine in the case of a BCB having an edge that loops back to
itself.
Given the complexity and risk involved in fixing the assertions, and the fact
that nothing relies on them actually being true, this patch just removes them
instead.
Remove redundant coroutine captures note
This note is redundant, since we'll always be printing this "captures the following types..." between *more* descriptive `BuiltinDerivedObligationCause`s.
Please review with whitespace disabled, since I also removed an unnecessary labeled break.
Expose `ucred::peer_cred` on QNX targets to enable dist builds
After following https://doc.rust-lang.org/rustc/platform-support/nto-qnx.html I attempted to run the following `x.py` command:
```bash
export build_env='
CC_aarch64-unknown-nto-qnx710=qcc
CFLAGS_aarch64-unknown-nto-qnx710=-Vgcc_ntoaarch64le_cxx
CXX_aarch64-unknown-nto-qnx710=qcc
AR_aarch64_unknown_nto_qnx710=ntoaarch64-ar
CC_x86_64-pc-nto-qnx710=qcc
CFLAGS_x86_64-pc-nto-qnx710=-Vgcc_ntox86_64_cxx
CXX_x86_64-pc-nto-qnx710=qcc
AR_x86_64_pc_nto_qnx710=ntox86_64-ar'
env $build_env ./x.py --stage 2 dist rust-std --target aarch64-unknown-nto-qnx710,x86_64-pc-nto-qnx710,x86_64-unknown-linux-gnu
```
The result was the following error:
```
Compiling object v0.32.2
Compiling std_detect v0.1.5 (/home/ana/git/rust-lang/rust/library/stdarch/crates/std_detect)
Compiling addr2line v0.21.0
error: function `peer_cred` is never used
--> library/std/src/os/unix/net/ucred.rs:89:12
|
89 | pub fn peer_cred(socket: &UnixStream) -> io::Result<UCred> {
| ^^^^^^^^^
|
= note: `-D dead-code` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(dead_code)]`
error: could not compile `std` (lib) due to 1 previous error
Build completed unsuccessfully in 0:06:25
```
I contacted `@flba-eb` and `@gh-tr` over email and we confirmed that `peer_cred` here should be flagged on `nto` targets. This should enable the clean `x.py --stage 2 dist rust-std` command on these platforms.
various clippy fixes
We need to keep the order of the given clippy lint rules before passing them.
Since clap doesn't offer any useful interface for this purpose out of the box,
we have to handle it manually.
Additionally, this PR makes `-D` rules work as expected. Previously, lint rules were limited to `-W`. By enabling `-D`, clippy began to complain numerous lines in the tree, all of which have been resolved in this PR as well.
Fixes#121481
cc `@matthiaskrgr`
Silence unecessary !Sized binding error
When gathering locals, we introduce a `Sized` obligation for each
binding in the pattern. *After* doing so, we typecheck the init
expression. If this has a type failure, we store `{type error}`, for
both the expression and the pattern. But later we store an inference
variable for the pattern.
We now avoid any override of an existing type on a hir node when they've
already been marked as `{type error}`, and on E0277, when it comes from
`VariableType` we silence the error in support of the type error.
Fix https://github.com/rust-lang/rust/issues/117846
`assigning_clones` should respect MSRV
Fixes: #12502
This PR fixes the `assigning_clones` lint suggesting to use `clone_from` or `clone_into` on incompatible MSRVs.
`assigning_clones` will suggest using either `clone_from` or `clone_into`, both of which were stabilized in 1.63. If the current MSRV is below 1.63, the lint should not trigger.
changelog: [`assigning_clones`]: don't lint when the MSRV is below 1.63.
When gathering locals, we introduce a `Sized` obligation for each
binding in the pattern. *After* doing so, we typecheck the init
expression. If this has a type failure, we store `{type error}`, for
both the expression and the pattern. But later we store an inference
variable for the pattern.
We now avoid any override of an existing type on a hir node when they've
already been marked as `{type error}`, and on E0277, when it comes from
`VariableType` we silence the error in support of the type error.
Fix#117846.
There are a bunch of small helper conditionals we use.
Inline them to get slightly better perf in a few cases,
especially when rustc is compiled without PGO.
Rollup of 10 pull requests
Successful merges:
- #122435 (Don't trigger `unused_qualifications` on global paths)
- #122556 (Extend format arg help for simple tuple index access expression)
- #122634 (compiletest: Add support for `//@ aux-bin: foo.rs`)
- #122677 (Fix incorrect mutable suggestion information for binding in ref pattern.)
- #122691 (Fix ICE: `global_asm!()` Don't Panic When Unable to Evaluate Constant)
- #122695 (Change only_local to a enum type.)
- #122717 (Ensure stack before parsing dot-or-call)
- #122719 (Ensure nested statics have a HIR node to prevent various queries from ICEing)
- #122720 ([doc]:fix error code example)
- #122724 (add test for casting pointer to union with unsized tail)
r? `@ghost`
`@rustbot` modify labels: rollup
Ensure stack before parsing dot-or-call
There are many cases where, due to codegen or a massively unruly codebase, a deeply nested `call(call(call(call(call(call(call(call(call(f())))))))))` can happen. This is a spot where it would be good to grow our stack, so that we can survive to tell the programmer their code is dubiously written.
Closes https://github.com/rust-lang/rust/issues/122715
