change #1:

                if (line.empty) {
                    if (deb != null && deb.valid)
                        debs.insert(deb);
                    else // report incomplete
                    deb = null;
                    continue;
                }
                if (deb == null)
                    deb = new Deb;

change #2: gets rid of most errors:

    bool opEquals(const Deb* other) const @safe pure nothrow {

    int opCmp(ref const Deb* other) const {

Just changed to pointers & moved to a separate file.

So now I just have one error in line 12 of model.d:

RedBlackTree!Deb* debs; // name-ordered list of deb packages LINE 12


Performing "debug" build using /home/mark/opt/ldc2-1.20.0-linux-x86_64/bin/ldc2 for x86_64. gtk-d:gtkd 3.9.0: target for configuration "library" is up to date.
debfind ~master: building configuration "application"...
src/model.d(12,9): Error: template instance std.container.rbtree.RedBlackTree!(Deb) does not match template declaration RedBlackTree(T, alias less = "a < b", bool allowDuplicates = false)
  with T = Deb
  must satisfy the following constraint:
       is(typeof(binaryFun!less(T.init, T.init)))
/home/mark/opt/ldc2-1.20.0-linux-x86_64/bin/ldc2 failed with exit code 1.

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