[erlang-questions] Dialyzer warning about patterns

Yash Ganthe yash_ganthe@REDACTED
Tue Jul 9 08:06:58 CEST 2013

I have the following code:

Port = open_port({spawn,Args},[{packet,2}]),
    case is_port(Port) of
    true  ->
        io:format("~n ~p port created successfully ~n",[Port]),
    false -> %%Line 52
        io:format("something went wrong ~n"),

Dialyzer gives the following warning:
mymod.erl:52: The pattern 'false' can never match the type 'true'

The possible results of is_port are true and false considering
is_port(Term) -> boolean()

What do I need to do to get rid of such warnings?


This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20130709/8c1e7eb7/attachment.htm>

More information about the erlang-questions mailing list