Cyclic message definitions

for the preparation of complex parameter support, I added support for cyclic message definitions
string name
Param[] other_params

During the review of the change (fix: Generate correct code for nested arrays of own type by jmachowinski · Pull Request #748 · ros2/rosidl · GitHub), the question came up if the missing support for this is just an oversight in the implementation, or if this is not supported by design.

I checked the design documents, and could not find an answer to this.

It would be great if someone with deeper knowledge could shine some light on this issue :wink:

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I’ve opened Cyclic/recursive message types · Issue #1445 · ros2/ros2 · GitHub as well to track this feature request.

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