Files
rust/tests/ui
Matthias Krüger 77e5bbf341 Rollup merge of #127889 - estebank:anon-arg-sugg, r=compiler-errors
More accurate span for anonymous argument suggestion

Use smaller span for suggesting adding `_:` ahead of a type:

```
error: expected one of `(`, `...`, `..=`, `..`, `::`, `:`, `{`, or `|`, found `)`
  --> $DIR/anon-params-denied-2018.rs:12:47
   |
LL |     fn foo_with_qualified_path(<Bar as T>::Baz);
   |                                               ^ expected one of 8 possible tokens
   |
   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: explicitly ignore the parameter name
   |
LL |     fn foo_with_qualified_path(_: <Bar as T>::Baz);
   |                                ++
```
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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>.