Tracking Issue for `--print=supported-crate-types`

This is a tracking issue for the compiler print request --print=supported-crate-types.
This print request is currently unstable, gated behind -Zunstable-options.

About tracking issues

Tracking issues are used to record the overall progress of implementation.
They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions.
A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature.
Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.
Discussion comments will get marked as off-topic or deleted.
Repeated discussions on the tracking issue may lead to the tracking issue getting locked.

Steps

• Draft and accept an MCP: https://github.com/rust-lang/compiler-team/issues/836
• Implement the print request as an unstable print option: https://github.com/rust-lang/rust/pull/138641
• Adjust documentation (see instructions on rustc-dev-guide): https://github.com/rust-lang/rust/pull/138641
• Stabilization PR (see instructions on rustc-dev-guide): TODO; after some baking

Unresolved Questions

• (Bikeshedding) Is supported-crate-types the best name for the print request?

Design decision history

None yet, since initial implementation.

Implementation history

• https://github.com/rust-lang/rust/pull/138641

Start with the rustc-dev-guide stabilization guide and review the implementation PR #138641, the MCP in compiler-team issue #836, and the unresolved naming question. Confirm the print request has had sufficient baking and determine the stabilization steps. Done means a stabilization PR addresses the remaining checklist item and resolves or records the naming decision.