Files
rust/tests/ui
bors 7f36543a48 Auto merge of #136332 - jhpratt:rollup-aa69d0e, r=jhpratt
Rollup of 9 pull requests

Successful merges:

 - #132156 (When encountering unexpected closure return type, point at return type/expression)
 - #133429 (Autodiff Upstreaming - rustc_codegen_ssa, rustc_middle)
 - #136281 (`rustc_hir_analysis` cleanups)
 - #136297 (Fix a typo in profile-guided-optimization.md)
 - #136300 (atomic: extend compare_and_swap migration docs)
 - #136310 (normalize `*.long-type.txt` paths for compare-mode tests)
 - #136312 (Disable `overflow_delimited_expr` in edition 2024)
 - #136313 (Filter out RPITITs when suggesting unconstrained assoc type on too many generics)
 - #136323 (Fix a typo in conventions.md)

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 interpret a test.

As part of an ongoing 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 a legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.