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

[Olivier BOUDEVILLE]

Hi,

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?

More precisely, in my case, a pseudo-module foobar is generated at runtime 
(compiled and loaded) with some functions (ex: baz/0), here from a test. 
When inspecting the BEAM of this test, as expected Dialyzer complains that 
there are calls to unknown function foobar:baz/0.

As I have no BEAM for this generated foobar, I suppose I cannot suppress 
warnings from foobar.

Typically in my test I would write '-dialyzer( { nowarn_function, 
foobar:baz/0 } ).' but I do not think that specifying "module-remote" 
functions is permitted? (the previous suppression triggers 'bad attribute' 
at compilation, because of the specification of the module, here  foobar)

A few other points:

 - random:ran/0 is mentioned in http://erlang.org/doc/man/random.html but 
does not seem to be exported; the same applies for file:mode/0

 - previously built-in parametric types could be used, like in  '-opaque 
hashtable( K, V ) :: tuple( bucket( K, V ) ).' or ' -opaque map_hashtable( 
K, V ) :: map( K, V ).'; it does not seem to be possible anymore, 
presumably in relation to OTP-11851? (ex: 'type tuple(_) undefined').

Finally, if generating the full PLT for Erlang itself, we have following 
warnings being issued:

"""
eunit_test.erl:305: Call to missing or unexported function 
eunit_test:nonexisting_function/0
xrc.erl:125: Call to missing or unexported function wxXmlResource:reload/2
Unknown functions:
  asn1rt_driver_handler:load_driver/0
  megaco_ber__media_gateway_control_v1:info/0
  wxWindows:'Destroy'/1
  wx_core:quit/0
"""

Maybe they could be fixed or suppressed?

Thanks for any information,
Best,

Olivier.
---------------------------
Olivier Boudeville

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Département SINETICS, groupe ASICS (I2A), bureau B-226
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