compiletest: Use //@ prefixes also for debuginfo test directives

[Enselic]

So that when we later add support for revisions we can use the same syntax for revisions as elsewhere.

This also prevents people from making typos for commands since src/tools/compiletest/src/directives/directive_names.rs will catch such typos now.

Note that we add one FIXME for a non-trivial change for later:

// FIXME(#148097): Change `// cdb-checksimple_closure` to `//@ cdb-check:simple_closure`

TODO

• Triple-check that all tests still run and all directives are still applied. Done: compiletest: Use //@ prefixes also for debuginfo test directives #147799 (comment)

Zulip discussion

https://rust-lang.zulipchat.com/#narrow/channel/326414-t-infra.2Fbootstrap/topic/.2F.2F.40.20syntax.20for.20debuginfo.20tests/with/545015582

[Enselic]

@bors try jobs=x86_64-msvc-1

[rust-bors]

☀️ Try build successful (CI)
Build commit: c89eb6c (c89eb6c72bc4a168b32b17a36f56df1e617c3cb3, parent: 51f5892019f8fb07864647d46c4eb577d3b0719f)

[Enselic]

@bors try jobs=x86_64-msvc-1

[rust-bors]

☀️ Try build successful (CI)
Build commit: 464c055 (464c055969e217e038285dbdafe6bcb4c174f8a0, parent: 17e7324d44c7b310b776302880fdd08d9252118a)

[Enselic]

x86_64-msvc-1 does not have cdb it seems, but I think aarch64 does:

@bors try jobs=aarch64-msvc-1

[rust-bors]

💔 Test for 8aa08e9 failed: CI. Failed jobs:

• try - aarch64-msvc-1 (web logs, extended logs)

[Enselic]

According to #t-compiler/debuginfo > debuginfo-lldb CI job? we need to run aarch64-apple to confirm that lldb tests can still fail.

@bors try jobs=aarch64-apple

[rust-bors]

💔 Test for 7e46723 failed: CI. Failed jobs:

• try - aarch64-apple (web logs, extended logs)

[Enselic]

I have now confirmed that gdb, lldb, and cdb tests can still fail, so this is ready for review.

Click to expand list of confirmed test failures.

2025-10-31T17:14:59.2821529Z failures:
2025-10-31T17:14:59.2821743Z     [debuginfo-gdb] tests/debuginfo/basic-types-globals.rs#no-lto
2025-10-31T17:14:59.2822093Z     [debuginfo-gdb] tests/debuginfo/basic-types-globals.rs#lto
2025-10-31T17:14:59.2822413Z     [debuginfo-gdb] tests/debuginfo/cross-crate-spans.rs
2025-10-31T17:14:59.2822777Z     [debuginfo-gdb] tests/debuginfo/lexical-scope-in-unconditional-loop.rs
2025-10-31T17:14:59.2823149Z     [debuginfo-gdb] tests/debuginfo/reference-debuginfo.rs

2025-11-03T05:35:52.5258000Z failures:
2025-11-03T05:35:52.5258190Z     [debuginfo-lldb] tests/debuginfo/struct-in-struct.rs
2025-11-03T05:35:52.5258470Z     [debuginfo-lldb] tests/debuginfo/tuple-struct.rs
2025-11-03T05:35:52.5258780Z     [debuginfo-lldb] tests/debuginfo/zst-interferes-with-prologue.rs

2025-11-01T23:05:16.4753232Z failures:
2025-11-01T23:05:16.4753850Z     [debuginfo-cdb] tests\debuginfo\basic-types.rs
2025-11-01T23:05:16.4754222Z     [debuginfo-cdb] tests\debuginfo\marker-types.rs

[rustbot]

compiletest directives have been modified. Please add or update docs for the
new or modified directive in src/doc/rustc-dev-guide/.

Some changes occurred in src/tools/compiletest

cc @jieyouxu

[rustbot]

r? @wesleywiser

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[bors]

☔ The latest upstream changes (presumably #147728) made this pull request unmergeable. Please resolve the merge conflicts.

[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[Enselic]

compiletest directives have been modified. Please add or update docs for the new or modified directive in src/doc/rustc-dev-guide/.

Not applicable for this PR since debuginfo directives are still special. We just want the same syntax as for normal directives.

Anyway, this PR is ready for review now.