[erlang-bugs] re type spec problem (not recognizing { capture, none })

Sverker Eriksson <>
Tue Jul 21 10:53:43 CEST 2009


Correction: Option {capture,none} was added to the dialyzer spec in R13A.

I will update the documentation for R13B02.

/Sverker, Erlang/OTP


Sverker Eriksson wrote:
> Looks like a simple omission. Will be fixed in R13B02.
>
> Thanks.
> /Sverker, Erlang/OTP
>
> Paul Mineiro wrote:
>> the module documentation doesn't list { capture, none } as a possibility
>> in the types section (but refers to it in the function description),
>> so i perhaps this is not dialyzer's fault (GIGO?).
>>
>> easy workaround: specify { capture, [] } instead of { capture, none }.
>>
>> cheers,
>>
>> -- p
>>
>> -------
>> -module (diabug).
>> -export ([f/0]).
>>
>> f () ->
>>   re:run ("yo", "yo", [ { capture, none } ]).
>> -------
>>
>> % erl
>> Erlang (BEAM) emulator version 5.6.5 [source] [async-threads:0] 
>> [kernel-poll:false]
>>
>> Eshell V5.6.5  (abort with ^G)
>> 1> c (diabug), diabug:f ().
>> match
>> 2>
>> User switch command
>>  --> q
>> % dialyzer --src -c diabug.erl
>>   Checking whether the PLT /home/pmineiro/.dialyzer_plt is 
>> up-to-date... yes
>>   Proceeding with analysis...
>> diabug.erl:4: Function f/0 has no local return
>> diabug.erl:5: The call re:run("yo","yo",[{'capture','none'},...]) 
>> will never return since it differs in argument position 3 from the 
>> success typing arguments: (binary() | maybe_improper_list(binary() | 
>> maybe_improper_list(any(),binary() | []) | byte(),binary() | 
>> []),binary() | maybe_improper_list(binary() | 
>> maybe_improper_list(any(),binary() | []) | byte(),binary() | []) | 
>> {'re_pattern',integer(),integer(),binary()},[atom() | 
>> {'capture','all' | 'all_but_first' | 'first' | [atom() | string() | 
>> integer()]} | {'newline','anycrlf' | 'cr' | 'crlf' | 'lf'} | 
>> {'offset',integer()} | {'capture','all' | 'all_but_first' | 'first' | 
>> [atom() | string() | integer()],'binary' | 'index' | 'list'}])
>>  done in 0m0.22s
>> done (warnings were emitted)
>>
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>>
>>   
>
>
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