-----------------------------------------------------------
module redblacktree;

import std.container : RedBlackTree;
import honeycomb : Location;   // Seems to import all of honeycomb.d symbols

struct Node
{
    this(Location locaction, uint f)
    {
        this.location = location;
        this.f = f;
    }
    Location location;
    uint f;
}


unittest
{
    auto priorQ = new RedBlackTree!(Node, "a.f < b.f", true);
    Node n1 = Node( Location(1,2), 33);
    // etc.
}
-----------------------------------------------------------

I'm trying to retrofit unit testing in an existing D project. But when I run the
command:

rdmd -main -unittest redblacktree.d

This error is returned:

honeycomb.d(11): Error: unable to read module `sdl`
honeycomb.d(11):        Expected 'bindbc\sdl.d' or 'bindbc\sdl\package.d' in one of the following import paths:
import path[0] = .
import path[1] = C:\D\dmd2\windows\bin64\..\..\src\phobos
import path[2] = C:\D\dmd2\windows\bin64\..\..\src\druntime\import

honeycomb.d module is just:

-----------------------------------------------------------
module honeycomb;

import bindbc.sdl;

struct Location   // holds a hex of a hexboard
{
    int r;  // row
    int c;  // colum
}
-----------------------------------------------------------

I thought that the line
import honeycomb : Location;
would only import the symbol struct Location?