[Issue 18019] getopt worng behaviour (ConvException instead of GetOptException)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18019

--- Comment #2 from Dmitry <dmitry at indiedev.ru> ---
Thank you for the explanation. Now I found it in the documentation:

> If the option has a parameter, that must be "stuck" to the option
> without any intervening space or "="

But it is not the reason why the issue was created. Main reason is that
behavoiur is different for "-help" (built-in option) and "-replace" (custom
option).

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