Files
rust/tests/ui
bors 03eb454523 Auto merge of #138155 - matthiaskrgr:rollup-xq5buio, r=matthiaskrgr
Rollup of 6 pull requests

Successful merges:

 - #137674 (Enable `f16` for LoongArch)
 - #138034 (library: Use `size_of` from the prelude instead of imported)
 - #138060 (Revert #138019 after further discussion about how hir-pretty printing should work)
 - #138073 (Break critical edges in inline asm before code generation)
 - #138107 (`librustdoc`: clippy fixes)
 - #138111 (Use `default_field_values` for `rustc_errors::Context`, `rustc_session::config::NextSolverConfig` and `rustc_session::config::ErrorOutputType`)

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>.