Show warning if #filename is safeguarded as in the pre-3.x style #2718
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Context: #2708 (comment)
I'm not totally sure that this is side-effect-free (there can be a legitimate case for #filename not to return value?) , but at least it can be helpful to some people.
I want to hear your opinion.
@y-yagi @RachalCassity @rajyan @ryan-mcneil
Closes #2708, Refs. #2659