Files
rust/tests/ui
bors df1b5d3cc2 Auto merge of #131466 - matthiaskrgr:rollup-3qtz83x, r=matthiaskrgr
Rollup of 7 pull requests

Successful merges:

 - #123951 (Reserve guarded string literals (RFC 3593))
 - #130827 (Library: Rename "object safe" to "dyn compatible")
 - #131383 (Add docs about slicing slices at the ends)
 - #131403 (Fix needless_lifetimes in rustc_serialize)
 - #131417 (Fix methods alignment on mobile)
 - #131449 (Decouple WASIp2 sockets from WasiFd)
 - #131462 (Mention allocation errors for `open_buffered`)

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>.