Files
rust/tests/ui
bors ebcb862bbb Auto merge of #126284 - jieyouxu:rollup-nq7bf9k, r=jieyouxu
Rollup of 6 pull requests

Successful merges:

 - #115974 (Split core's PanicInfo and std's PanicInfo)
 - #125659 (Remove usage of `isize` in example)
 - #125669 (CI: Update riscv64gc-linux job to Ubuntu 22.04, rename to riscv64gc-gnu)
 - #125684 (Account for existing bindings when suggesting `pin!()`)
 - #126055 (Expand list of trait implementers in E0277 when calling rustc with --verbose)
 - #126174 (Migrate `tests/run-make/prefer-dylib` to `rmake.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>.