Async statemachine optimisation

[tomassedovic]

Metadata
Point of contact	@diondokter
Team(s)	compiler
Goal document	2026/async-statemachine-optimisation

Summary

Add optimisations to the coroutine MIR transform to elide or simplify the generated statemachines.

This will help both async futures and generators.

Note: This has some overlap with this other proposal.
I'm not trying to usurp the issue. I was working on it incidentally at the same time and noticed very late that proposal already existed.

Tasks and status

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Note: we have updated the body to match the 2026 goal. Your original text is preserved below.

Details

Metadata
Point of contact	@diondokter
Team(s)	compiler
Goal document	2026/async-statemachine-optimisation

Summary

Add optimisations to the coroutine MIR transform to elide or simplify the generated statemachines.

This will help both async futures and generators.

Note: This has some overlap with this other proposal.
I'm not trying to usurp the issue. I was working on it incidentally at the same time and noticed very late that proposal already existed.

Tasks and status

[tomassedovic]

This issue is intended for status updates only.

For general questions or comments, please contact the owner(s) directly.

[diondokter]

MCP for async-panics flag opened: rust-lang/compiler-team#1016