[erlang-questions] Can't run my command line Erlang program

Andrew Pennebaker <>
Fri Nov 15 05:03:07 CET 2013


Is there a way to clear the "unknown functions" from dialyzer output? They
tend to distract from any warnings I'm trying to find.

$ make lint
erlc -Wall +debug_info ios7crypt.erl
dialyzer *.beam --build_plt --quiet
dialyzer *.beam
  Checking whether the PLT /Users/andrew/.dialyzer_plt is up-to-date... yes
  Proceeding with analysis...
Unknown functions:
  crypto:exor/2
  erlang:binary_to_list/1
  erlang:get_module_info/1
  erlang:get_module_info/2
  erlang:list_to_integer/2
  erlang:now/0
  getopt:parse/2
  getopt:usage/2
  init:get_plain_arguments/0
  init:stop/0
  io:format/1
  io:format/2
  io_lib:format/2
  proper:forall/2
  proper:quickcheck/1
  proper_types:int/0
  proper_types:list/1
  random:seed/3
  random:uniform/1
  string:concat/2
  string:substr/3
 done in 0m0.17s
done (passed successfully)


On Thu, Nov 14, 2013 at 10:59 PM, Andrew Pennebaker <
> wrote:

> I think I was trying to account for errors in parsing integers. In any
> case, I think my program still works fine without this check, especially as
> we agree that dialyzer proves it's unnecessary.
>
>
> https://github.com/mcandre/ios7crypt/commit/8d7f7760b15ffa48a5113356803f620f3935c256#diff-7f4a95d512e55854e52ac3744eaafeb1L52
>
>
> On Thu, Nov 14, 2013 at 8:00 PM, Kostis Sagonas <> wrote:
>
>> On 11/15/2013 01:46 AM, Andrew Pennebaker wrote:
>>
>>> In particular, I'm confused what dialyzer doesn't like about line 60.
>>>
>>> 59  FirstOne = case is_binary(FirstTemp) of
>>> 60    true -> binary_to_list(FirstTemp);
>>> 61    false -> FirstOneRaw
>>> 62  end,
>>>
>>> Not sure what's wrong. I tried using `_` instead of `false`, but got the
>>> same warning. Should I use an if/else instead of case?
>>>
>>
>> Dialyzer is telling you that it thinks FirstTemp will never be a binary
>> in your program, so the case statement you have there is unnecessary. So,
>> effectively it tells you that you can rewrite the code above to:
>>
>>       FirstOne = FirstOneRaw,
>>
>> The question is why do you expect that FirstTemp may be a binary at that
>> point?
>>
>> Kostis
>>
>
>
>
> --
> Cheers,
>
> Andrew Pennebaker
> www.yellosoft.us
>



-- 
Cheers,

Andrew Pennebaker
www.yellosoft.us
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