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Dylan DPC e597d06144
Rollup merge of #95547 - RalfJung:ptr-int-transmutes, r=scottmcm 
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`
2022-04-05 22:58:56 +02:00
..
alloc Rollup merge of #95354 - dtolnay:rustc_const_stable, r=lcnr 2022-04-02 03:34:21 +02:00
array remove now unnecessary lang items 2022-03-30 11:23:58 +02:00
async_iter Add Stream alias for AsyncIterator 2022-03-15 20:59:13 -07:00
char Adjust feature names that disagree on const stabilization version 2022-03-31 12:34:48 -07:00
convert Rollup merge of #92541 - asquared31415:from-docs, r=m-ou-se 2022-03-09 23:14:10 +01:00
ffi make memcmp return a value of c_int_width instead of i32 2022-04-02 17:21:08 -07:00
fmt Rollup merge of #95438 - m-ou-se:sync-unsafe-cell, r=joshtriplett 2022-04-04 20:41:32 +02:00
future Rollup merge of #91192 - r00ster91:futuredocs, r=GuillaumeGomez 2022-02-21 19:36:46 +01:00
hash Make the stdlib largely conform to strict provenance. 2022-03-29 20:18:21 -04:00
iter Rollup merge of #93950 - T-O-R-U-S:use-modern-formatting-for-format!-macros, r=Mark-Simulacrum 2022-03-10 23:12:57 +01:00
macros Update panic docs to make it clearer when to use panic vs Result 2022-04-04 16:09:49 -07:00
mem core: document that the align_of* functions return the alignment in bytes 2022-04-03 19:06:21 +01:00
num Stabilize total_cmp 2022-04-04 18:57:49 +09:00
ops Mention implementers of unsatisfied trait 2022-04-04 21:01:42 +00:00
panic Mark Location::caller() as #[inline] 2022-04-03 20:32:39 +02:00
prelude update cfg(bootstrap)s 2022-01-28 15:01:07 +01:00
ptr Rollup merge of #95630 - declanvk:update-nonnull-doc, r=RalfJung 2022-04-05 01:53:34 +02:00
slice Mention implementers of unsatisfied trait 2022-04-04 21:01:42 +00:00
str remove now unnecessary lang items 2022-03-30 11:23:58 +02:00
sync Rollup merge of #95354 - dtolnay:rustc_const_stable, r=lcnr 2022-04-02 03:34:21 +02:00
task Rollup merge of #89869 - kpreid:from-doc, r=yaahc 2022-02-17 06:29:57 +01:00
unicode Regenerate tables for Unicode 14.0.0 2021-10-06 17:49:33 -07:00
any.rs Use implicit capture syntax in format_args 2022-03-10 10:23:40 -05:00
ascii.rs Inline <EscapeDefault as Iterator>::next 2022-03-10 15:35:22 +01:00
bool.rs remove now unnecessary lang items 2022-03-30 11:23:58 +02:00
borrow.rs Make Borrow and BorrowMut impls const 2021-12-04 21:57:39 +09:00
cell.rs Add tracking issue for sync_unsafe_cell. 2022-03-29 19:54:00 +02:00
clone.rs Rename ~const Drop to ~const Destruct 2022-03-21 17:04:03 +11:00
cmp.rs Edit docs on consistency of PartialOrd and PartialEq 2022-03-04 13:31:32 -06:00
default.rs Add #[must_use] to remaining core functions 2021-10-30 18:21:29 -04:00
hint.rs Add core::hint::must_use 2022-03-08 10:58:03 -08:00
internal_macros.rs Add a copy of cfg_if to core's internal_macros.rs 2022-03-01 16:24:10 -08:00
intrinsics.rs Rollup merge of #95547 - RalfJung:ptr-int-transmutes, r=scottmcm 2022-04-05 22:58:56 +02:00
lazy.rs Rollup merge of #89869 - kpreid:from-doc, r=yaahc 2022-02-17 06:29:57 +01:00
lib.rs Rollup merge of #95438 - m-ou-se:sync-unsafe-cell, r=joshtriplett 2022-04-04 20:41:32 +02:00
marker.rs Use implicit capture syntax in format_args 2022-03-10 10:23:40 -05:00
option.rs Adjust feature names that disagree on const stabilization version 2022-03-31 12:34:48 -07:00
panic.rs resolve the conflict in compiler/rustc_session/src/parse.rs 2022-03-16 20:12:30 +08:00
panicking.rs Use implicit capture syntax in format_args 2022-03-10 10:23:40 -05:00
pin.rs fix pin doc typo 2022-03-06 21:40:30 +08:00
primitive.rs mv std libs to library/ 2020-07-27 19:51:13 -05:00
primitive_docs.rs Use implicit capture syntax in format_args 2022-03-10 10:23:40 -05:00
result.rs Adjust feature names that disagree on const stabilization version 2022-03-31 12:34:48 -07:00
time.rs Adjust feature names that disagree on const stabilization version 2022-03-31 12:34:48 -07:00
tuple.rs mv std libs to library/ 2020-07-27 19:51:13 -05:00
unit.rs Use implicit capture syntax in format_args 2022-03-10 10:23:40 -05:00