[erlang-questions] Must and May convention

Karlo Kuna <>
Wed Sep 27 11:30:15 CEST 2017


could we have something in type specifications that indicates throw case:

-spec f_name( Args ) -> .....; throw(TE | TE1 | ....).

On Wed, Sep 27, 2017 at 11:25 AM, Attila Rajmund Nohl <
> wrote:

> 2017-09-27 11:08 GMT+02:00 Joe Armstrong <>:
> [...]
> > This turns out to be very convenient - I read many files
> > in my programs, so it's nice to know that must_read_file
> > will print a nice error message and terminate
> > if I give it a bad filename.
> >
> > Note: I can get the program to crash by writing
> >
> >    {ok, B} = file:read_file(F)
> >
> > But I don't get a nice error message telling me the filename.
> >
> > Any takers?
>
> My problem with all kinds of very common prefixes is that it breaks
> function name autocompletion. Or at least makes it harder to use when
> I have dozens/hundreds/thousands of function names starting with the
> same 3-5 characters - either I have to type those 3-5 characters all
> the time plus any more characters to find unique prefix for
> autocompletion or have to autocomplete twice (one for the may/must
> difference, one for the actual function name). Eclipse (for Java)
> helpfully shows the method signature including return value and thrown
> exceptions - I think this problem should be solved by the IDEs and not
> by naming conventions.
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