[Issue 18879] !is doesn't highlight correctly

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18879

--- Comment #5 from Rainer Schuetze <r.sagitario at gmx.de> ---
Actually never implemented in the "new" parser that is now used for about 5
years. I've added it now and preview should be available in a couple of minutes
here: https://ci.appveyor.com/project/rainers/visuald

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