Generated code for `FSM` has restriction No_Streams but no tagged type

[mgrojo]

While trying to use SPARK.Containers.Formal.Unbounded_Hashed_Maps in CoAP_SPARK, I've received this error:

error: "rflx-coap_server-main_loop-fsm.adb" has restriction No_Streams
error: but the following files violate this restriction:
error:   "spark-containers-formal-unbounded_hashed_maps.adb"
gprbind: invocation of gnatbind failed
gprbuild: unable to bind coap_server.adb

According to the GNAT Reference Manual, this restriction "allows optimization of tagged types", but I haven't found any tagged type in the code generated by RecordFlux.

I've tried commenting out this restriction in the generated code, and everything seems to be working fine.

Why is this restriction included? Is it really needed, or is the leftover of a previous use of tagged types?

[treiher]

We indeed used tagged types for the state machines in the past. As this is not the case anymore, the No_Streams restriction can be removed.