Wrong error message for `nil.func()`

[ericmj]

Current behaviour:

iex(1)> nil.test() 
** (UndefinedFunctionError) undefined function: test/0
    test()

Expected behaviour:

iex(1)> nil.test() 
** (UndefinedFunctionError) undefined function: nil.test/0
    nil.test()

[josevalim]

This seems to be a general issue as it also happens with elixir -e "nil.test". For this reason, I would probably look into the lib/elixir/lib/exception.ex file.

[tonini]

@josevalim Should it behave like @ericmj explained above just in case of nil.func() or also with any kind of non :erlang_module.func() and Module.func() prefix? Like whatever.func()

[josevalim]

@tonini the cases like :test.func() are return the format that @ericmj described. If they don't, it is a bug. :)

[tonini]

@josevalim In the case of :test.func() and Test.func() it's working. :)

What I meant was should everything which is NOT :test.func() and Test.func() like nil.test() and foo.bar() work like:

iex(1)> nil.test() 
** (UndefinedFunctionError) undefined function: nil.test/0
    nil.test()

and

iex(1)> foo.bar() 
** (UndefinedFunctionError) undefined function: foo.test/0
    foo.bar() 

[josevalim]

Ah, no. foo.test/0 should actually return undefined function: THE_VALUE_OF_FOO.test/0 or undefined variable foo in case it is not defined (which is how it works today).

[tonini]

Ah ok I see, but in case of:

or undefined variable foo in case it is not defined (which is how it works today).

The output is:

iex(1)> foo.test()
** (UndefinedFunctionError) undefined function: foo()

Nothing about undefined variable foo.

[josevalim]

Yeah, the current behaviour for those is fine. :)

[tonini]

ok :) Thanks for the feedback, I'll get back to you when I have something.