Files
rust/tests/ui
bors caa187f3bc Auto merge of #125744 - fmease:rollup-ky7d098, r=fmease
Rollup of 7 pull requests

Successful merges:

 - #125653 (Migrate `run-make/const-prop-lint` to `rmake.rs`)
 - #125662 (Rewrite `fpic`, `simple-dylib` and `issue-37893` `run-make` tests in `rmake.rs` or ui test format)
 - #125699 (Streamline `x fmt` and improve its output)
 - #125701 ([ACP 362] genericize `ptr::from_raw_parts`)
 - #125723 (Migrate `run-make/crate-data-smoke` to `rmake.rs`)
 - #125733 (Add lang items for `AsyncFn*`, `Future`, `AsyncFnKindHelper`'s associated types)
 - #125734 (ast: Revert a breaking attribute visiting order change)

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>.