[Issue 6754] extern() in a function signature

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=6754

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
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                 CC|                            |b2.temp at gmx.com
           Hardware|Other                       |All
                 OS|Windows                     |All

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