bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

patterns: reject raw pointers that are not just integers

Browse source
This commit is contained in:
Ralf Jung 2023-10-19 08:36:24 +02:00
parent 3089c315b1
commit bec88ad4aa
10 changed files with 92 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

5
compiler/rustc_lint_defs/src/builtin.rs
View file

@ -2217,13 +2217,14 @@ declare_lint! {
///
/// ### Explanation
///
/// Previous versions of Rust allowed function pointers and wide raw pointers in patterns.
/// Previous versions of Rust allowed function pointers and all raw pointers in patterns.
/// While these work in many cases as expected by users, it is possible that due to
/// optimizations pointers are "not equal to themselves" or pointers to different functions
/// compare as equal during runtime. This is because LLVM optimizations can deduplicate
/// functions if their bodies are the same, thus also making pointers to these functions point
/// to the same location. Additionally functions may get duplicated if they are instantiated
/// in different crates and not deduplicated again via LTO.
/// in different crates and not deduplicated again via LTO. Pointer identity for memory
/// created by `const` is similarly unreliable.
pub POINTER_STRUCTURAL_MATCH,
Allow,
"pointers are not structural-match",