anchor.diff:  
     /// Returns a string description of the dependencies on [name].
     String describeDependencies(String name) =>
  -      getDependencies(name).map((dep) => "  $dep").join('\n');
  +      getDependenciesOn(name).map((dep) => "  $dep").join('\n');
   
     /// Gets the list of known dependencies on package [name].
     ///
     /// Creates an empty list if needed.
  -  List<Dependency> getDependencies(String name) =>
  +  List<Dependency> getDependenciesOn(String name) =>
         _dependencies.putIfAbsent(name, () => <Dependency>[]);
   }
  
positive.code:     // Add all of [id]'s dependencies to [_dependencies], as well as to
      // [_unselected] if necessary.
      await Future.forEach(await _solver.depsFor(id), (dep) async {
        var deps = getDependencies(dep.name);
        deps.add(new Dependency(id, dep));
  
        // If this is the first dependency on this package, add it to the
  
negative.code:     await _unselected.add(id.toRef());
  
      for (var dep in await _solver.depsFor(id)) {
        var deps = getDependenciesOn(dep.name);
        deps.removeLast();
  
        if (deps.isEmpty) {
  