Avoid ICE caused by suggestion
When suggesting dereferencing something that can be iterable in a `for`
loop, erase lifetimes and use a fresh `ty::ParamEnv` to avoid 'region
constraints already solved' panic.
Fix#87657, fix#87709, fix#87651.
Fix closure migration suggestion when the body is a macro.
Fixes https://github.com/rust-lang/rust/issues/87955
Before:
```
warning: changes to closure capture in Rust 2021 will affect drop order
--> src/main.rs:5:13
|
5 | let _ = || panic!(a.0);
| ^^^^^^^^^^---^
| |
| in Rust 2018, closure captures all of `a`, but in Rust 2021, it only captures `a.0`
6 | }
| - in Rust 2018, `a` would be dropped here, but in Rust 2021, only `a.0` would be dropped here alongside the closure
|
help: add a dummy let to cause `a` to be fully captured
|
20~ ($msg:expr $(,)?) => ({ let _ = &a;
21+ $crate::rt::begin_panic($msg)
22~ }),
|
```
After:
```
warning: changes to closure capture in Rust 2021 will affect drop order
--> src/main.rs:5:13
|
5 | let _ = || panic!(a.0);
| ^^^^^^^^^^---^
| |
| in Rust 2018, closure captures all of `a`, but in Rust 2021, it only captures `a.0`
6 | }
| - in Rust 2018, `a` would be dropped here, but in Rust 2021, only `a.0` would be dropped here alongside the closure
|
help: add a dummy let to cause `a` to be fully captured
|
5 | let _ = || { let _ = &a; panic!(a.0) };
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
Implement `black_box` using intrinsic
Introduce `black_box` intrinsic, as suggested in https://github.com/rust-lang/rust/pull/87590#discussion_r680468700.
This is still codegenned as empty inline assembly for LLVM. For MIR interpretation and cranelift it's treated as identity.
cc `@Amanieu` as this is related to inline assembly
cc `@bjorn3` for rustc_codegen_cranelift changes
cc `@RalfJung` as this affects MIRI
r? `@nagisa` I suppose
Silence non_fmt_panic from external macros.
This stops the non_fmt_panic lint from triggering if a macro from another crate is entirely responsible. In those cases there's nothing that the current crate can/should do.
See also https://github.com/rust-lang/rust/issues/87621#issuecomment-890311054
Improve formatting of closure capture migration suggestion for multi-line closures.
Fixes https://github.com/rust-lang/rust/issues/87952
Before:
```
help: add a dummy let to cause `a` to be fully captured
|
5 ~ let _ = || { let _ = &a;
6 + dbg!(a.0);
7 ~ };
|
```
After:
```
help: add a dummy let to cause `a` to be fully captured
|
5 ~ let _ = || {
6 + let _ = &a;
7 + dbg!(a.0);
8 ~ };
|
```
Add c_enum_min_bits target spec field, use for arm-none and thumb-none targets
Fixes https://github.com/rust-lang/rust/issues/87917
<s>Haven't tested this yet, still playing around.</s>
This seems to fix the issue.
Implement `black_box` using intrinsic
Introduce `black_box` intrinsic, as suggested in https://github.com/rust-lang/rust/pull/87590#discussion_r680468700.
This is still codegenned as empty inline assembly for LLVM. For MIR interpretation and cranelift it's treated as identity.
cc `@Amanieu` as this is related to inline assembly
cc `@bjorn3` for rustc_codegen_cranelift changes
cc `@RalfJung` as this affects MIRI
r? `@nagisa` I suppose
Adds extensive test for all the [r]split* iterators.
Fixes size_hint upper bound for split_inclusive* iterators which was one higher than necessary for non-empty slices.
Fixes size_hint lower bound for [r]splitn* iterators when n==0, which was one too high.
The new implementation allows some `memcpy`s to be optimized away,
so the uninit value in ui/sanitize/memory.rs is constructed directly
onto the return place. Therefore the sanitizer now says that the
value is allocated by `main` rather than `random`.
