This is a tracking issue for the RFC "result_ffi_guarantees" (rust-lang/rfcs#3391).

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.

Steps

• Implement (test) the RFC
  • Support Result<T, E> across FFI when niche optimization can be used #122253
  • Support Result<T, E> across FFI when niche optimization can be used (v2) #124747
  • Update Result docs to the new guarantees #124870
  • Add more ABI test cases to miri (RFC 3391) #125672
• Adjust documentation (see instructions on rustc-dev-guide)
• Stabilization PR (see instructions on rustc-dev-guide) (not necessary, reference FCP should be all that's needed)

Unresolved Questions

None

Implementation history