Bug in pyergo?

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Robert Goldman

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Oct 4, 2025, 11:12:52 AMOct 4

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I believe I have found a bug in pyergo (I will try to get a MWE as soon as possible):

If I make a query to an all-solutions predicate that returns the empty list, then the binding I get back from pyergo is an ErgoSymbol whose value property is not bound to the empty list, it is bound to the string "[]" -- the string containing the open and closed bracket characters.

This makes the results of a query extremely hard to unpack correctly on the python side, since we cannot dispatch on the type of the value.