bors 94885bc699 Auto merge of #129854 - Kobzol:revert-127537, r=lqd
Revert "Auto merge of #127537 - veluca93:struct_tf, r=BoxyUwU"

This reverts https://github.com/rust-lang/rust/pull/127537 (commit acb4e8b6251f1d8da36f08e7a70fa23fc581839e), reversing changes made to 100fde5246bf56f22fb5cc85374dd841296fce0e.

Opening to see if this can help resolve the recent perf. results [instability](https://rust-lang.zulipchat.com/#narrow/stream/247081-t-compiler.2Fperformance/topic/Weird.20perf.20results).
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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>.