[Issue 18172] std.getopt should allow taking parameters by `ref` (like std.format.formattedRead), s.t. it can be used in @safe

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18172

--- Comment #9 from Seb <greensunny12 at gmail.com> ---
> then I get linker errors about stuff in std.conv being undefined, but there are no more errors from the compiler itself. I think that that happens sometimes when some code is compiled with -dip1000 and some without, but I'm not sure. 

-dip1000 is ABI-incompatible with normal D, but Walter (nor anyone else) seems
to care.

https://github.com/dlang/phobos/pull/5915#issuecomment-350426192

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