bors b08148f6a7 Auto merge of #111869 - Dylan-DPC:rollup-9pydw08, r=Dylan-DPC
Rollup of 6 pull requests

Successful merges:

 - #111461 (Fix symbol conflict diagnostic mistakenly being shown instead of missing crate diagnostic)
 - #111579 (Also assume wrap-around discriminants in `as` MIR building)
 - #111704 (Remove return type sized check hack from hir typeck)
 - #111853 (Check opaques for mismatch during writeback)
 - #111854 (rustdoc: clean up `settings.css`)
 - #111860 (Don't ICE if method receiver fails to unify with `arbitrary_self_types`)

r? `@ghost`
`@rustbot` modify labels: rollup
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The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb