Files
rust/tests/ui
Michael Goulet 7e5528fa55 Rollup merge of #125795 - lucasscharenbroch:undescore-prefix-suggestion, r=compiler-errors
Improve renaming suggestion for names with leading underscores

Fixes #125650

Before:
```
error[E0425]: cannot find value `p` in this scope
 --> test.rs:2:13
  |
2 |     let _ = p;
  |             ^
  |
help: a local variable with a similar name exists, consider renaming `_p` into `p`
  |
1 | fn a(p: i32) {
  |      ~
```

After:
```
error[E0425]: cannot find value `p` in this scope
 --> test.rs:2:13
  |
1 | fn a(_p: i32) {
  |      -- `_p` defined here
2 |     let _ = p;
  |             ^
  |
help: the leading underscore in `_p` marks it as unused, consider renaming it to `p`
  |
1 | fn a(p: i32) {
  |      ~
```

This change doesn't exactly conform to what was proposed in the issue:

1. I've kept the suggested code instead of solely replacing it with the label
2. I've removed the "...similar name exists..." message instead of relocating to the usage span
3. You could argue that it still isn't completely clear that the change is referring to the definition (not the usage), but I'm not sure how to do this without playing down the fact that the error was caused by the usage of an undefined name.
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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>.