[Issue 21730] null ptr dereferenced in ChunksImpl.opApply (SIGSEGV)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21730

--- Comment #2 from kdevel <kdevel at vogtner.de> ---
> - Fix Issue 21730 - null ptr dereferenced in ChunksImpl.opApply (SIGSEGV)
> 
> https://github.com/dlang/phobos/pull/8025

https://github.com/dlang/phobos/pull/8025/commits/ce741c13f5dd0975b87c3ab69fc0ac1318d344f7

The "x" in 

   File(deleteme, "w+x");

is a GNU extension. POSIXly correct is

   File(deleteme, "w+");

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