Files
rust/tests/ui
bors b286722878 Auto merge of #127635 - matthiaskrgr:rollup-foopajr, r=matthiaskrgr
Rollup of 6 pull requests

Successful merges:

 - #127164 (match lowering: Clarify the main loop of the algorithm)
 - #127422 (as_simd: fix doc comment to be in line with align_to)
 - #127596 (More suggestion for converting `Option<&Vec<T>>` to `Option<&[T]>`)
 - #127607 (compiletest: Better error message for bad `normalize-*` headers)
 - #127622 (Mark `builtin_syntax` as internal)
 - #127625 (Revert accidental comment deletion)

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>.