Files
rust/tests/ui
Matthias Krüger e4bbca2a9b Rollup merge of #135523 - RalfJung:wrong-known-bug, r=compiler-errors
const traits: remove some known-bug that do not seem to make sense

These tests were made to point to #103507 in https://github.com/rust-lang/rust/pull/114134; I think that was a mistake: that issue is about a rather specific problem, and most tests marked as known-bug in that PR are pointing at https://github.com/rust-lang/rust/issues/110395 which makes more sense.

Of the 4 tests that still point to #103507:
- One is [the original test](https://github.com/rust-lang/rust/blob/20882608529a969bd878ad787cf0038716c021df/tests/ui/impl-trait/normalize-tait-in-const.rs). It still fails to compile, though currently for unrelated reasons (`~const Fn` is not valid as that is not a const trait). I made it point at #110395 like all the other tests that were disabled when the previous const trait impl was removed.
- One is being fixed in https://github.com/rust-lang/rust/pull/135423
- The other two are fixed in this PR

The errors we are getting here are not great but they do look correct?

FWIW there are still a whole lot of tests mentioning #110395 despite that issue being closed... I hope someone is tracking that.^^

r? `@compiler-errors`
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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 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-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 a legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.