Matthias Krüger 663da00876
Rollup merge of #131239 - VulnBandit:trait-vulnerability, r=lcnr
Don't assume traits used as type are trait objs in 2021 edition

Fixes #127548

When you use a trait as a type, the compiler automatically assumes you meant to use a trait object, which is not always the case.
This PR fixes the bug where you don't need a trait object, so the error message was changed to:
```
error[E0782]: expected a type, found a trait
```
Also fixes some ICEs:
Fixes https://github.com/rust-lang/rust/issues/120241
Fixes https://github.com/rust-lang/rust/issues/120482
Fixes https://github.com/rust-lang/rust/issues/125512
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This is serves as a collection of crashes so that accidental ICE fixes are tracked. This was formally done at https://github.com/rust-lang/glacier but doing it inside the rustc testsuite is more convenient.

It is imperative that a test in the suite causes an internal compiler error/panic or makes rustc crash in some other way. A test will "pass" if rustc exits with something other than 1 or 0.

When adding crashes from https://github.com/rust-lang/rust/issues, the issue number should be noted in the file name (12345.rs should suffice) and perhaps also inside the file via //@ known-bug #4321

If you happen to fix one of the crashes, please move it to a fitting subdirectory in tests/ui and give it a meaningful name. Also please add a doc comment at the top of the file explaining why this test exists. :) Adding Fixes #NNNNN Fixes #MMMMM to the description of your pull request will ensure the corresponding tickets will be closed automatically upon merge. The ticket ids can be found in the file name or the known-bug annotation inside the testfile.