[TVMScript][Relax] Allow return statement in DataflowBlock #17131
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Prior to this commit, TVMScript required the return value of a Relax to be specified outside of any
with R.dataflow()
blocks. This resulted in a common pattern, where the return value of a function was first called withR.output(ret_value)
, to markret_value
as atvm::relax::Var
instead of atvm::relax::DataflowVar
, followed immediately by areturn ret_value
statement.This commit updates the TVMScript parser to allow a
return
statement inside awith R.dataflow()
block. This is syntactic sugar that is equivalent to callingR.output
, followed by areturn
.With this change, the following two TVMScript examples are now equivalent. (Prior to this change, the
return_inside_dataflow
example would raise an error during parsing.)