Files
rust/tests/ui
bors 6a207f4ff2 Auto merge of #126262 - jieyouxu:rollup-g29lo3c, r=jieyouxu
Rollup of 5 pull requests

Successful merges:

 - #125913 (Spruce up the diagnostics of some early lints)
 - #126234 (Delegation: fix ICE on late diagnostics)
 - #126253 (Simplify assert matchers in `run-make-support`)
 - #126257 (Rename `needs-matching-clang` to `needs-force-clang-based-tests`)
 - #126259 (reachable computation: clarify comments around consts)

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>.