case newline:
				// TODO(gri) need to handle mandatory newlines after a //-style comment
				if !p.linebreaks {
					x = blank
				}
			}
			p.addWhitespace(x, "")

		// case *Comment: // comments are not Nodes
		// 	p.addWhitespace(comment, x.Text)

		default:
			panic(fmt.Sprintf("unexpected argument %v (%T)", x, x))
		}
	}
}

func (p *printer) printNode(n Node) {