Tracking Issue for infallible promotion · Issue #80619 · rust-lang/rust (original) (raw)

This is a tracking issue for the RFC "3027" (rust-lang/rfcs#3027).
The RFC does not have a feature gate.

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 the RFC
• Adjust documentation (see instructions on rustc-dev-guide)

Unresolved Questions

• What should we do about promoting const fn calls in const/static initializers? See this crater analysis and this Zulip thread.

Implementation history

• stop promoting union field accesses in 'const' #77526
• remove this weird special case from promotion #78363
• avoid promoting division, modulo and indexing operations that could fail #80579