[Issue 19092] __delete doesn't work with immutable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19092

--- Comment #5 from Mike Franklin <slavo5150 at yahoo.com> ---
> The issue is that the compiler deprecated `delete` and offers `__delete`as an alternative (with destroy/free as optional) and it doesn't work as advertised!

`delete` was deprecated in favor of `destroy` and `free`ing functions. 
`__delete` was offered only as a last resort in case `destroy` was not
possible.  If you're reaching for `__delete` first, you are not using D as it
was intended to be used and you are only going to create problems for yourself
and for the maintainers of D.  Please avoid it, if possible.

--