https://issues.dlang.org/show_bug.cgi?id=20776

moonlightsentinel@disroot.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |moonlightsentinel@disroot.o
                   |                            |rg
         Resolution|---                         |INVALID

--- Comment #1 from moonlightsentinel@disroot.org ---
This is the expected behaviour of an is-expression. Unqal is not a function but a template aliasing to another type. `Unqal!K` isn't a valid type once you omit the import which causes the `is` to evaluate to false.

> Type is the type being tested. It must be syntactically correct, but it need not be semantically correct. If it is not semantically correct, the condition is not satisfied.

See https://dlang.org/spec/expression.html#is_expression

--