bors 7e3a971870 Auto merge of #128378 - matthiaskrgr:rollup-i3qz9uo, r=matthiaskrgr
Rollup of 4 pull requests

Successful merges:

 - #127574 (elaborate unknowable goals)
 - #128141 (Set branch protection function attributes)
 - #128315 (Fix vita build of std and forbid unsafe in unsafe in the os/vita module)
 - #128339 ([rustdoc] Make the buttons remain when code example is clicked)

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