Files
rust/tests/ui
bors 6acb9e75eb Auto merge of #120845 - petrochenkov:debmac, r=oli-obk
debuginfo: Stabilize `-Z debug-macros`, `-Z collapse-macro-debuginfo` and `#[collapse_debuginfo]`

`-Z debug-macros` is "stabilized" by enabling it by default and removing.

`-Z collapse-macro-debuginfo` is stabilized as `-C collapse-macro-debuginfo`.
It now supports all typical boolean values (`parse_opt_bool`) in addition to just yes/no.

Default value of `collapse_debuginfo` was changed from `false` to `external` (i.e. collapsed if external, not collapsed if local) - https://github.com/rust-lang/rust/issues/100758#issuecomment-1935815625 describes some debugging scenarios that motivate this default as reasonable.
`#[collapse_debuginfo]` attribute without a value is no longer supported to avoid guessing the default.

Stabilization report: https://github.com/rust-lang/rust/pull/120845#issuecomment-1939145242

Closes https://github.com/rust-lang/rust/issues/100758
Closes https://github.com/rust-lang/rust/issues/41743
Closes https://github.com/rust-lang/rust/issues/39153
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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>.