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rust/tests/ui
bors 7ed1a51b25 Auto merge of #131980 - matthiaskrgr:rollup-iy5nw71, r=matthiaskrgr
Rollup of 5 pull requests

Successful merges:

 - #131814 (`optimize` attribute applied to things other than methods/functions/c…)
 - #131927 (Check for filecheck directives in files marked `skip-filecheck`)
 - #131967 (Remove `lower_mono_bounds`)
 - #131973 (fix(rustdoc-json-types): document rustc-hash feature)
 - #131976 (feat(rustdoc-json-types): mark simple enums as copy)

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>.