Files
rust/tests/ui
bors 686bfc4c42 Auto merge of #125010 - matthiaskrgr:rollup-270pck3, r=matthiaskrgr
Rollup of 5 pull requests

Successful merges:

 - #124928 (Stabilize `byte_slice_trim_ascii` for `&[u8]`/`&str`)
 - #124954 (Document proper usage of `fmt::Error` and `fmt()`'s `Result`.)
 - #124969 (check if `x test tests` missing any test directory)
 - #124978 (Handle Deref expressions in invalid_reference_casting)
 - #125005 (Miri subtree update)

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>.