class Sass::Tree::Visitors::DeepCopy
def visit_mixindef(node)
def visit_mixindef(node) node.args = node.args.map {|k, v| [k.deep_copy, v && v.deep_copy]} yield end
def visit_mixindef(node) node.args = node.args.map {|k, v| [k.deep_copy, v && v.deep_copy]} yield end