Files
rust/tests/ui
bors 69482e8e5a Auto merge of #136851 - jhpratt:rollup-ftijn95, r=jhpratt
Rollup of 11 pull requests

Successful merges:

 - #136606 (Fix long lines which rustfmt fails to format)
 - #136663 (Stabilize `NonZero::count_ones`)
 - #136672 (library: doc: core::alloc::Allocator: trivial typo fix)
 - #136704 (Improve examples for file locking)
 - #136721 (cg_llvm: Reduce visibility of some items outside the `llvm` module)
 - #136813 (rustc_target: Add the fp16 target feature for AArch32)
 - #136830 (fix i686-unknown-hurd-gnu x87 footnote)
 - #136832 (Fix platform support table for i686-unknown-uefi)
 - #136835 (Stop using span hack for contracts feature gating)
 - #136837 (Overhaul how contracts are lowered on fn-like bodies)
 - #136839 (fix ensure_monomorphic_enough)

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>.