Files
rust/tests/ui
Matthias Krüger bcf24d6467 Rollup merge of #123830 - tgross35:f16-f128-from-inference-fix, r=Nilstrieb
Remove `From` impls for unstable types that break inference

Adding additional `From` implementations that fit `f32::from(<unaffixed float>)` broke inference. Remove these for now.

I added a test to make sure this doesn't quietly change in the future, even though the behavior is not technically guaranteed https://github.com/rust-lang/rust/issues/123824#issuecomment-2050628184

Fixes: <https://github.com/rust-lang/rust/issues/123824>
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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>.