Files
rust/tests/ui
bors 27e38f8fc7 Auto merge of #132626 - workingjubilee:rollup-hbmtbzk, r=workingjubilee
Rollup of 11 pull requests

Successful merges:

 - #131153 (Improve duplicate derive Copy/Clone diagnostics)
 - #132025 (fix suggestion for diagnostic error E0027)
 - #132303 (More tests for non-exhaustive C-like enums in FFI)
 - #132492 (remove support for extern-block const intrinsics)
 - #132587 (Revert "Avoid nested replacement ranges" from #129346.)
 - #132596 ([rustdoc] Fix `--show-coverage` when JSON output format is used)
 - #132598 (Clippy: Move some attribute lints to be early pass (post expansion))
 - #132601 (Update books)
 - #132606 (Improve example of `impl Pattern for &[char]`)
 - #132608 (document `type_implements_trait`)
 - #132609 (docs: fix grammar in doc comment at unix/process.rs)

r? `@ghost`
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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>.