Files
rust/tests/ui
bors c67326b063 Auto merge of #122571 - matthiaskrgr:rollup-36wwovk, r=matthiaskrgr
Rollup of 6 pull requests

Successful merges:

 - #122254 (Detect calls to .clone() on T: !Clone types on borrowck errors)
 - #122495 (Visually mark 👻hidden👻 items with document-hidden-items)
 - #122543 (Add `#![rustc_never_type_mode = "..."]` crate-level attribute to allow experimenting)
 - #122560 (Safe Transmute: Use 'not yet supported', not 'unspecified' in errors)
 - #122562 (Mention labelled blocks in `break` docs)
 - #122563 (CI: cache PR CI Docker builds)

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>.