Files
rust/tests/ui
Matthias Krüger d1250bc1d5 Rollup merge of #127929 - estebank:addr_of, r=compiler-errors
Use more accurate span for `addr_of!` suggestion

Use a multipart suggestion instead of a single whole-span replacement:

```
error[E0796]: creating a shared reference to a mutable static
  --> $DIR/reference-to-mut-static-unsafe-fn.rs:10:18
   |
LL |         let _y = &X;
   |                  ^^ shared reference to mutable static
   |
   = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
help: use `addr_of!` instead to create a raw pointer
   |
LL |         let _y = addr_of!(X);
   |                  ~~~~~~~~~ +
```
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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>.