[Issue 20452] std.conv: to and parse dont work correct with negative numbers

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20452

berni44 <bugzilla at d-ecke.de> changed:

           What    |Removed                     |Added
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           Hardware|x86_64                      |All
                 OS|Linux                       |All
           Severity|enhancement                 |normal

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