[Issue 15136] If we want toStringz to be fully correct, it needs to stop checking for '\0'

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15136

--- Comment #4 from Steven Schveighoffer <schveiguy at yahoo.com> ---
(In reply to Steven Schveighoffer from comment #3)
> assert(s[5] == 'b');

That should have read str[5], obviously :)

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