[erlang-bugs] dialyzer does not like queue:out

Paul Guyot <>
Mon Jul 18 13:59:47 CEST 2011

> Paul Guyot wrote:
>> Hello,
>> Dialyzer seems to consider that the second element of the output of queue:out/1 is not a queue.
>> The following code reproduces the error:
>> ...
>> Dialyzer will say:
>> dialyzer_queue.erl:11: The pattern {'ok', _Value, _NewRec} can never match the type {'none',#rec{q::queue()}}
>> The error disappears if g returns {ok, Elem, Rec} instead of {ok, Elem, #rec{q = NewQueue}}, or if rec.q is typed as any().
> This is a known problem.
> Can you please try the 'dev' version because I think it is fixed there.


It seems I messed up something in the upgrade process and cannot reproduce the bug today, after having rebuilt the plt. So indeed, it looks like it's fixed.

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