[erlang-questions] A few type-related 18.0 questions

[Olivier BOUDEVILLE]

Hello Tuncer,

tuncer.ayaz@REDACTED a écrit sur 26/06/2015 23:42:18 :

[...]
> > Using 18.0, is there a way of specifying to Dialyzer that warnings
> > about calls to non-existing functions should be suppressed by
> > telling that from outside of the module that is supposed to define
> > these functions?
> 
> Yes, Hans Bolinder was kind enough to add it on short notice during
> the 18.0 cycle.
> 
> We use it in rebar, which has to work on anything from R13B03 to 18.0.
> https://github.com/rebar/rebar/blob/6cc18c931c/src/rebar_utils.erl#L75:
> 
> -dialyzer({no_missing_calls, escript_foldl/3}).
> 
> This tells Dialyzer to ignore calls to unknown functions when
> analyzing escript_foldl/3.
> 
> Does this work for you?

Thanks for your reply and sorry for my late message.

The suppression I was mentioning regarded a call from a plain module M1 to 
another module M2 that is generated at runtime (compile:form/2) and then 
loaded (code:load_binary/3): Dialyzer then sees in M1 an actual call to a 
module M2 that it cannot find (no source nor BEAM file, for obvious 
reasons). 

In this case I do not think we can tell Dialyzer to suppress this warning 
(since the -dialyzer attribute seems to be meant to be used in the sources 
*of the module itself*, i.e. it would have here to be specified in the 
sourceless M2).

This is not a big issue (and these are edges cases indeed), but it would 
be interesting if we could define 'global' suppressions, or that would 
apply to a set of modules (similarly, Dialyzer would not be able to see 
that conditional calls could be done based on the actual availability of 
the exported function - using module_info/1 for that; Dialyzer would then 
detect a potential call to a non-existing function, it would be neat if we 
could specify that these warnings should be suppressed as we know that 
this cannot happen).

Thanks again,
Best,

Olivier.

---------------------------
Olivier Boudeville

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