switch s := spec.(type) {
	case *ast.ImportSpec:
		p.setComment(s.Doc)
		if s.Name != nil {
			p.expr(s.Name)
			p.print(blank)
		}
		p.expr(sanitizeImportPath(s.Path))
		p.setComment(s.Comment)
		p.setPos(s.EndPos)

	case *ast.ValueSpec:
		if n != 1 {
			p.internalError("expected n = 1; got", n)
		}
		p.setComment(s.Doc)
		p.identList(s.Names, doIndent) // always present

		{"(*Writer).Create", Method, 0},
		{"(*Writer).CreateHeader", Method, 0},
		{"(*Writer).CreateRaw", Method, 17},
		{"(*Writer).Flush", Method, 4},
		{"(*Writer).RegisterCompressor", Method, 6},
		{"(*Writer).SetComment", Method, 10},
		{"(*Writer).SetOffset", Method, 5},
		{"Compressor", Type, 2},
		{"Decompressor", Type, 2},
		{"Deflate", Const, 0},
		{"ErrAlgorithm", Var, 0},
		{"ErrChecksum", Var, 0},