Files
rust/tests/ui
bors 91a0e1604f Auto merge of #138127 - compiler-errors:rollup-kcarqrz, r=compiler-errors
Rollup of 17 pull requests

Successful merges:

 - #137827 (Add timestamp to unstable feature usage metrics)
 - #138041 (bootstrap and compiletest: Use `size_of_val` from the prelude instead of imported)
 - #138046 (trim channel value in `get_closest_merge_commit`)
 - #138053 (Increase the max. custom try jobs requested to `20`)
 - #138061 (triagebot: add a `compiler_leads` ad-hoc group)
 - #138064 (Remove - from xtensa targets cpu names)
 - #138075 (Use final path segment for diagnostic)
 - #138078 (Reduce the noise of bootstrap changelog warnings in --dry-run mode)
 - #138081 (Move `yield` expressions behind their own feature gate)
 - #138090 (`librustdoc`: flatten nested ifs)
 - #138092 (Re-add `DynSend` and `DynSync` impls for `TyCtxt`)
 - #138094 (a small borrowck cleanup)
 - #138098 (Stabilize feature `const_copy_from_slice`)
 - #138103 (Git ignore citool's target directory)
 - #138105 (Fix broken link to Miri intrinsics in documentation)
 - #138108 (Mention me (WaffleLapkin) when changes to `rustc_codegen_ssa` occur)
 - #138117 ([llvm/PassWrapper] use `size_t` when building arg strings)

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 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>.