P2 Description
I recently received the following error for my structural DoFn: "failed to find ProcessElement method". However, I had implemented ProcessElement - the error was that I failed to take the address of the DoFn struct as the parameter for the ParDo.
I think this error could be much clearer. Taking a look at the implementation, I see that it somewhat is: https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/graph/fn.go#L154. However, this error message doesn't match the implementation, which also accepts the struct as-is. I assume the struct is accepted here for other uses of `NewFn` (eg. `RegisterFunction`), as from my example above, for the `ParDo` case, this just goes on to surface a less-clear error deeper in the call chain.
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