bors 31110152e2 Auto merge of #124811 - matthiaskrgr:rollup-4zpov13, r=matthiaskrgr
Rollup of 4 pull requests

Successful merges:

 - #124520 (Document that `create_dir_all` calls `mkdir`/`CreateDirW` multiple times)
 - #124724 (Prefer lower vtable candidates in select in new solver)
 - #124771 (Don't consider candidates with no failing where clauses when refining obligation causes in new solver)
 - #124808 (Use `super_fold` in `RegionsToStatic` visitor)

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 intepret a test.

As part of an on-going 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 an legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.