Diagnostics Reference

ID	Title	When It Appears	How To Fix
ASG0001	Actor with multiple input types must be disjoint	Multiple entry steps share the same input type, so routing is ambiguous.	Use distinct input types for each entry step or consolidate the steps to a single entry point.
ASG0002	Actor must have at least one input type	No methods are marked with [FirstStep], [Step], or receiver attributes.	Add an entry method with [FirstStep] or [Step] (or Receiver) so the actor can accept input.
ASG0003	Error generating source	An exception occurred during generation; details are in the diagnostic message.	Fix the underlying exception (often invalid signatures, missing partial keyword, or template issues) and re-run dotnet test.

Notes

• All diagnostics use category ActorSrcGen and report the actor symbol location when available.
• Generation stops at errors; resolve them to resume emission.
• Use dotnet test --filter Category=Integration to reproduce most diagnostic scenarios.