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# UI Tests
This folder contains `rustc`'s
[UI tests](https://rustc-dev-guide.rust-lang.org/tests/ui.html).
## 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`](https://github.com/oli-obk/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
```rs
// ignore-test
```
but in `ui_test` style, the header would be written as
```rs
//@ 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>`.
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