Could not find declaration !

[JinShil]

import std.stdio;

final abstract class ABC
{
    static @property bool mybool()
    {
        return true;
    }
}

void main(string[] s)
{
    while(!ABC.mybool) {}
}

Mousing over !ABC.mybool gives the following output in dcd-server:

[info ] Startup completed in 0.267283 milliseconds.
[info ] Getting doc comment
[error] Could not find declaration of ! from position 157
[error] Could not find symbol

Arch Linux 64-bit.