Rollup of 3 pull requests #71851
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Rollup of 3 pull requests #71851
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In the same vein as `Cell::take` and `Option::take`.
as `Applicability::Unspecified`
…asKalbertodt Add `RefCell::take` Add `RefCell::take` to match `Cell` and `Option`. I also changed a couple of calls to `.replace` to `.take`. Tracking issue is rust-lang#71395. This is my first contribution, please tell me if there's anything I could improve, thanks!
Suggest deref when coercing `ty::Ref` to `ty::RawPtr` with arbitrary mutability Fixes rust-lang#71676 1. Implement dereference suggestion when coercing `ty::Ref` to `ty::RawPtr` with arbitrary mutability. 2. Extract the dereference steps into `deref_steps()`, which removes all the `use` and `pub` noise introduced by last PR rust-lang#71540, and makes the code more readable. 3. Use the `remove_prefix()` closure which makes the prefix removal more readable. 4. Introduce `Applicability` as a return value of `check_ref` to suggest `Applicability::Unspecified` suggestion. **Special**: I found it is not possible to genereate `Applicability::MachineApplicable` suggestion for situation like this: ```rust use std::ops::Deref; use std::ops::DerefMut; struct Bar(u8); struct Foo(Bar); struct Emm(Foo); impl Deref for Bar{ type Target = u8; fn deref(&self) -> &Self::Target { &self.0 } } impl Deref for Foo { type Target = Bar; fn deref(&self) -> &Self::Target { &self.0 } } impl Deref for Emm { type Target = Foo; fn deref(&self) -> &Self::Target { &self.0 } } impl DerefMut for Bar{ fn deref_mut(&mut self) -> &mut Self::Target { &mut self.0 } } impl DerefMut for Foo { fn deref_mut(&mut self) -> &mut Self::Target { &mut self.0 } } impl DerefMut for Emm { fn deref_mut(&mut self) -> &mut Self::Target { &mut self.0 } } fn main() { let a = Emm(Foo(Bar(0))); let _: *mut u8 = &a; //~ ERROR mismatched types } ``` We may suggest `&mut ***a` here, but the `a` is not declared as mutable variable. And also when processing HIR, it's not possible to check if `a` is declared as a mutable variable (currently we do borrow checking with MIR). So we cannot ensure that suggestion when coercing immutable reference to mutable pointer is always machine applicable. Therefore I added a `Applicability` return value in `check_ref()`. And move the `immutable reference -> mutable pointer` situation into a sperate test file without `run-rustfix`. (It seems that `run-rustfix` will also adopt `Applicability::Unspecified` suggestion, which is strange)
…uillaumeGomez Add long error explanation for E0539 since this error is similar to [E0551](https://github.com/rust-lang/rust/blob/master/src/librustc_error_codes/error_codes/E0551.md) most of the content was copied from it. part of rust-lang#61137.
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Successful merges:
RefCell::take#71398 (AddRefCell::take)ty::Reftoty::RawPtrwith arbitrary mutability #71726 (Suggest deref when coercingty::Reftoty::RawPtrwith arbitrary mutability)Failed merges:
r? @ghost