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All the Perl that's Practical to Extract and Report

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  • We recently hit against a bug with this the opposite way round. The JSON [] module's objToJson function takes a Perl data structure and returns a Json string representation of it. But if the input is undef then it uses bare return.

    The bug was that this return value was being used in the parameter list of another function, and the bare return meant there was a argument missing.

    Once we'd spotted the bug it was simple to put scalar before the call to objToJson, but it was subtle. If a function is documented as always returning exactly one piece of data then it might be better if it always does that, even if that means returning undef in list context.