[erlang-patches] Spurious(?) dialyzer warnings for built-ins

Tobias Lindahl <>
Wed Mar 11 11:11:45 CET 2009

Hi Bernard,

This is already taken care of in the development branch for R13.

Although your patch solves the immediately visible problem, it is not 
the proper way to handle it. Dialyzer needs to have information about 
all built-in functions for the analysis, and the warning tells us (the 
developers) that this is not the case.

The warning should not have appeared in the released otp, it was a 
mistake due to lack of communication.


PS We do appreciate you sending us the patch and encourage others to do 
the same.

Bernard Duggan wrote:
> Hi all,
>     There's been a couple of questions on the -questions list recently
> about what look to be spurious "Call to missing or unexported function"
> warnings generated by dialyzer about the use of built-in functions (the
> specific one that we saw was re:compile/2, but there are others too). 
> The only response I've seen has been "just ignore it" - it seems that if
> a warning is being generated that should always be ignored, it's
> probably preferable not to generate it in the first place.
>     Therefore, here's a simple patch against 12B-5 which removes the
> particular warning - I'm not aware of any issues this should cause, but
> nor am I a dialyzer expert and I'm happy to be corrected (or indeed to
> hear a reason why we should generate this warning).
> Cheers,
> Bernard
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