bors 854f22563c Auto merge of #136350 - matthiaskrgr:rollup-6eqfyvh, r=matthiaskrgr
Rollup of 9 pull requests

Successful merges:

 - #134531 ([rustdoc] Add `--extract-doctests` command-line flag)
 - #135860 (Compiler: Finalize dyn compatibility renaming)
 - #135992 (Improve documentation when adding a new target)
 - #136194 (Support clobber_abi in BPF inline assembly)
 - #136325 (Delay a bug when indexing unsized slices)
 - #136326 (Replace our `LLVMRustDIBuilderRef` with LLVM-C's `LLVMDIBuilderRef`)
 - #136330 (Remove unnecessary hooks)
 - #136336 (Overhaul `rustc_middle::util`)
 - #136341 (Remove myself from vacation)

r? `@ghost`
`@rustbot` modify labels: rollup
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UI Tests

This folder contains rustc's UI tests.

Test Directives (Headers)

Typically, a UI test will have some test directives / headers which are special comments that tell compiletest how to build and interpret a test.

As part of an ongoing effort to rewrite compiletest (see https://github.com/rust-lang/compiler-team/issues/536), a major change proposal to change legacy compiletest-style headers // <directive> to ui_test-style headers //@ <directive> was accepted (see https://github.com/rust-lang/compiler-team/issues/512.

An example directive is ignore-test. In legacy compiletest style, the header would be written as

// ignore-test

but in ui_test style, the header would be written as

//@ ignore-test

compiletest is changed to accept only //@ directives for UI tests (currently), and will reject and report an error if it encounters any comments // <content> that may be parsed as a legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.