e597d06144
caution against ptr-to-int transmutes I don't know how strong of a statement we want to make here, but I am very concerned that the current docs could be interpreted as saying that ptr-to-int transmutes are just as okay as transmuting `*mut T` into an `&mut T`. Examples [like this](https://github.com/rust-lang/unsafe-code-guidelines/issues/286#issuecomment-1085144431) show that ptr-to-int transmutes are deeply suspicious -- they are either UB, or they don't round-trip properly, or we have to basically say that `transmute` will actively look for pointers and do all the things a ptr-to-int cast does (which includes a global side-effect of marking the pointed-to allocation as 'exposed'). Another alternative might be to simply not talk about them... but we *do* want people to use casts rather than transmutes for this. Cc `@rust-lang/lang` |
||
|---|---|---|
| .. | ||
| alloc | ||
| backtrace@b02ed04a7e | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| portable-simd | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@bcbe010614 | ||
| test | ||
| unwind | ||