rustc: avoid compiler generated unsafe blocks leaking.
#12419
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Previously an `unsafe` block created by the compiler (like those in the
formatting macros) would be "ignored" if surrounded by `unsafe`, that
is, the internal unsafety would be being legitimised by the external
block:
unsafe { println!("...") } =(expansion)=> unsafe { ... unsafe { ... } }
And the code in the inner block would be using the outer block, making
it considered used (and the inner one considered unused).
This patch forces the compiler to create a new unsafe context for
compiler generated blocks, so that their internal unsafety doesn't
escape to external blocks.
Fixes rust-lang#12418.
bors
added a commit
that referenced
this pull request
Feb 21, 2014
Previously an `unsafe` block created by the compiler (like those in the
formatting macros) would be "ignored" if surrounded by `unsafe`, that
is, the internal unsafety would be being legitimised by the external
block:
unsafe { println!("...") } =(expansion)=> unsafe { ... unsafe { ... } }
And the code in the inner block would be using the outer block, making
it considered used (and the inner one considered unused).
This patch forces the compiler to create a new unsafe context for
compiler generated blocks, so that their internal unsafety doesn't
escape to external blocks.
Fixes #12418.
flip1995
pushed a commit
to flip1995/rust
that referenced
this pull request
Mar 7, 2024
Handle plural acronyms in `doc_markdown` Prevent `doc_markdown` from triggering on words like `OSes` and `UXes`. changelog: handle plural acronyms in `doc_markdown`
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Previously an
unsafeblock created by the compiler (like those in theformatting macros) would be "ignored" if surrounded by
unsafe, thatis, the internal unsafety would be being legitimised by the external
block:
And the code in the inner block would be using the outer block, making
it considered used (and the inner one considered unused).
This patch forces the compiler to create a new unsafe context for
compiler generated blocks, so that their internal unsafety doesn't
escape to external blocks.
Fixes #12418.