What's the proper way to use std.getopt?

[Jonathan M Davis]

On Wednesday, December 13, 2017 06:55:46 bauss via Digitalmars-d-learn 
wrote:
> On Tuesday, 12 December 2017 at 18:34:26 UTC, Mike Wey wrote:
> > On 12-12-17 00:35, Seb wrote:
> >> D style would be to use sth. like this (instead of try/catch):
> >>
> >> ```
> >> scope(failure) {
> >>
> >>    e.msg.writeln;
> >>    1.exit;
> >>
> >> }
> >> ```
> >
> > I might have missed something, but where is `e` defined in this
> > case?
>
> I was thinking the same and can't find anything in the
> documentation that states you can retrieve the exception that
> caused the failure by an "e" variable.
>
> All I could find is that in case you need to use the exception
> you'd have to do a try/catch.
>
> So ultimately that code wouldn't work, according to the language
> specs.
>
> I haven't tested it, so I don't know if it's some hidden feature,
> but if it is, then I'm against it.

If it works, it's a bug related to code lowering (since scope statements are
always lowered to try-catch-finally blocks). You're not supposed to have
access to the exception in a scope statement.

- Jonathan M Davis