Signed-off-by: Alex Saveau <saveau.alexandre@gmail.com>

… consts

This should be done in rust-lang#110653 but forgot.

Add LazyCell::into_inner

This enables uses cases that need to extract the evaluated value and do something owned with it.

…unsound-issues, r=jackh726

Add `known-bug` tests for 11 unsound issues

r? ``@jackh726``

Should tests for other issues be in separate PRs?  Thanks.

Edit: Partially addresses rust-lang#105107.  This PR adds `known-bug` tests for 11 unsound issues:
- rust-lang#25860
- rust-lang#49206
- rust-lang#57893
- rust-lang#84366
- rust-lang#84533
- rust-lang#84591
- rust-lang#85099
- rust-lang#98117
- rust-lang#100041
- rust-lang#100051
- rust-lang#104005

…=jackh726

Add some tests around (lack of) object safety of associated types and consts

See https://rust-lang.zulipchat.com/#narrow/stream/144729-t-types/topic/.60where.20Self.3ASized.60.20on.20assoc.20types/near/351260928 for some discussion around why this isn't allowed.

We didn't have any tests for these, so I decided to add them now, even if we don't end up doing anything about it.

Some cleanups to DataflowConstProp

Mostly moving code around and short-circuiting useless cases.

format panic message only once

For `panic!` and friends, the `std` panic runtime will always set the `.payload()` of `PanicInfo` to the formatted string. The linked issues show that formatting the message twice can cause problems, so we simply print the already formatted message instead of formatting it again. We can't remove the preformatted payload, because it can be observed by custom panic hooks.

fixes rust-lang#110717
fixes rust-itertools/itertools#694

cc ```@Amanieu``` who broke this in rust-lang#109507

…, r=ehuss

bootstrap: update paths cargo-credential crate

This should be done in rust-lang#110653 but forgot.

Fixes rust-lang#110742

## How to verify this patch

Run `./x.py build cargo`. Previously it would fail with

```console
error: manifest path `/projects/rust/src/tools/cargo/crates/credential/cargo-credential-1password/Cargo.toml` does not exist
```