April 20, 2014
https://issues.dlang.org/show_bug.cgi?id=12600

          Issue ID: 12600
           Summary: Variant doesn't support coercion with bools
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Phobos
          Assignee: nobody@puremagic.com
          Reporter: akb825@gmail.com

When you attempt to coerce a Variant value to a bool (i.e. v.coerce!bool) you get the static assert "unsupported type for coercion".

--