func doAssignment(rift *lang.Rift, env collections.PersistentMap, assignment *lang.Assignment) interface{} { // TODO: Should I use lazy assignment here? var name string if rift.Name() == "main" { name = assignment.Ref().String() } else { name = rift.Name() + ":" + assignment.Ref().String() } env.Set(name, evaluate(rift, env, assignment.Value())) return nil }