Confusing error message when omitting `as dynamic`

[Jonno]

The following code

class VoidError
	def doError(x)
		return x

	def main
		.doError(1)

produces the error

error: Keyword "void" cannot be used in this context=

which appears to come straight from the C# compiler. Coming back from Python, I forgot to add as dynamic to the method signature. Would it be possible to detect a return statement in a void method and either treat as dynamic as implied, or raise a more suitable error message that pertains directly to the Cobra source?