…ls/alloc.rs` nicer

- Use `.addr()` instead of `as`-cast
- Use `add` instead of `offset` and remove some `as isize` casts by doing that
- Remove some casts

in different namespaces, one public and another private.

Instead of setting them for all primary and additional IDs of the import, only set them for the binding's true ID.

This rule became redundant in 07e3f99.
When `#source-sidebar` became nested below `.sidebar`, it went from being
`position: fixed` to `position: static`, and according to MDN's [z-index]
documentation, this means it has no effect.

[z-index]: https://developer.mozilla.org/en-US/docs/Web/CSS/z-index

This rule became redundant in 07e3f99.
When `#source-sidebar` became nested below `.sidebar`, it went from being
`position: fixed` to `position: static`, and according to MDN's [z-index]
documentation, this means it has no effect.

[z-index]: https://developer.mozilla.org/en-US/docs/Web/CSS/z-index

Fixes rust-lang#101065

…oot folder

Refactor some `std` code that works with pointer offstes

This PR replaces `pointer::offset` in standard library with `pointer::add` and `pointer::sub`, [re]moving some casts and using `.addr()` while we are at it.

This is a more complicated refactor than all other sibling PRs, so take a closer look when reviewing, please 😃  (though I've checked this multiple times and it looks fine).

r? ````@scottmcm````

_split off from rust-lang#100746, continuation of #100822_

Fix wrongly refactored Lift impl

see rust-lang#101858 (comment)

r? ``@bjorn3``

resolve: Set effective visibilities for imports more precisely

Instead of setting them for all primary and additional IDs of the import, only set them for the binding's true ID.

…=fee1-dead

Add const_closure, Constify Try trait

Adds a struct for creating const `FnMut` closures (for now just copy pasted form my [const_closure](https://crates.io/crates/const_closure) crate).
I'm not sure if this way is how it should be done.
The `ConstFnClosure` and `ConstFnOnceClosure` structs can probably also be entirely removed.

This is then used to constify the try trait.

Not sure if i should add const_closure in its own pr and maybe make it public behind a perma-unstable feature gate.

cc ```@fee1-dead```  ```@rust-lang/wg-const-eval```

…, r=GuillaumeGomez

rustdoc: remove no-op CSS `#source-sidebar { z-index }`

This rule became redundant in 07e3f99. When `#source-sidebar` became nested below `.sidebar`, it went from being `position: fixed` to `position: static`, and according to MDN's [z-index] documentation, this means it has no effect.

[z-index]: https://developer.mozilla.org/en-US/docs/Web/CSS/z-index

…ivially-drop, r=oli-obk

Make `ManuallyDrop` satisfy `~const Destruct`

…r=cjgillot

diagnostics: avoid syntactically invalid suggestion in if conditionals

Fixes rust-lang#101065

…-obk

bootstrap/miri: switch to non-deprecated env var for setting the sysroot folder

r? `@oli-obk`