[Issue 15971] BigInt ctor should accept forward ranges

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15971

Seb <greensunny12 at gmail.com> changed:

           What    |Removed                     |Added
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           Keywords|                            |bootcamp
                 CC|                            |greensunny12 at gmail.com

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