var less = {}; less.strictMath = true; less.functions = {

add: function(a, b) {
  return new(less.tree.Dimension)(a.value + b.value);
},
increment: function(a) {
  return new(less.tree.Dimension)(a.value + 1);
},
_color: function(str) {
  if (str.value === "evil red") {
    return new(less.tree.Color)("600");
  }
}

};