[Issue 18879] !is doesn't highlight correctly

[d-bugmail at puremagic.com]

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

--- Comment #11 from Rainer Schuetze <r.sagitario at gmx.de> ---
You are supposed to be able to configure that on the colorizer options page
with the "Colored types" by adding

[Keyword]
is in

but that's currently not working when the token has been classified as an
operator. I've changed that for the next build.

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