Tracking issue for MCP 937: Use `annotate-snippets` as the default emitter on nightly

[rustbot]

This is a tracking issue for MCP "Use annotate-snippets as the default emitter on nightly" (rust-lang/compiler-team#937).

Note

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Instead, open a dedicated issue for the specific matter, link to this tracking issue and ping the MCP author.
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Steps

• Implement the MCP
• Adjust documentation
  • In the Rust Compiler Development Guide if applicable (e.g., for refactorings)
  • In the Rust Forge if applicable (e.g., for policy changes)
  • In the rustc book if applicable (e.g., for target tier or CLI changes)

Unresolved questions

None so far.

Implementation history

• feat: Use annotate-snippets by default on nightly #148188

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@Muscraft, consider @rustbot claim'ing the work.