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Remove MaybeMutBorrowedLocals

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This commit is contained in:
Tomasz Miąsko 2021-10-29 00:00:00 +00:00
parent 473eaa42e9
commit b285e0c5d8
7 changed files with 26 additions and 207 deletions
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9
compiler/rustc_const_eval/src/transform/check_consts/resolver.rs
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@ -110,6 +110,15 @@ where
}
}
/// `&` and `&raw` only allow mutation if the borrowed place is `!Freeze`.
///
/// This assumes that it is UB to take the address of a struct field whose type is
/// `Freeze`, then use pointer arithmetic to derive a pointer to a *different* field of
/// that same struct whose type is `!Freeze`. If we decide that this is not UB, we will
/// have to check the type of the borrowed **local** instead of the borrowed **place**
/// below. See [rust-lang/unsafe-code-guidelines#134].
///
/// [rust-lang/unsafe-code-guidelines#134]: https://github.com/rust-lang/unsafe-code-guidelines/issues/134
fn shared_borrow_allows_mutation(&self, place: mir::Place<'tcx>) -> bool {
!place
.ty(self.ccx.body, self.ccx.tcx)