return
			} else if next == ')' {
				rparen := in.lex()
				if in.peek().isEOL() {
					// Empty block.
					in.lex()
					in.file.Stmt = append(in.file.Stmt, &LineBlock{
						Start:  start,
						Token:  tokens,
						LParen: LParen{Pos: tok.pos},
						RParen: RParen{Pos: rparen.pos},
					})
					return
				}
				// '( )' in the middle of the line, not a block.

		}
	}

	opening := p.expect(token.LPAREN)

	var fields []*ast.Field
	if p.tok != token.RPAREN {
		fields = p.parseParameterList(nil, nil, token.RPAREN)
	}

	rparen := p.expect(token.RPAREN)
	params = &ast.FieldList{Opening: opening, List: fields, Closing: rparen}

	return
}

func (p *parser) parseResult() *ast.FieldList {
	if p.trace {

	if p.trace {
		defer un(trace(p, "Parameters"))
	}

	var params []*ast.Field
	lparen := p.expect(token.LPAREN)
	if p.tok != token.RPAREN {
		params = p.parseParameterList(scope, ellipsisOk)
	}
	rparen := p.expect(token.RPAREN)

	return &ast.FieldList{lparen, params, rparen}
}

func (p *parser) parseResult(scope *ast.Scope) *ast.FieldList {
	if p.trace {
		defer un(trace(p, "Result"))
	}

		d.Specs = specs

		// Deduping can leave a blank line before the rparen; clean that up.
		if len(d.Specs) > 0 {
			lastSpec := d.Specs[len(d.Specs)-1]
			lastLine := lineAt(fset, lastSpec.Pos())
			rParenLine := lineAt(fset, d.Rparen)
			for rParenLine > lastLine+1 {
				rParenLine--
				fset.File(d.Rparen).MergeLine(rParenLine)
			}
		}
	}
}

	ASSIGN // =
	NOT    // !

	NEQ      // !=
	LEQ      // <=
	GEQ      // >=
	DEFINE   // :=
	ELLIPSIS // ...

	LPAREN // (
	LBRACK // [
	LBRACE // {
	COMMA  // ,
	PERIOD // .

	RPAREN    // )
	RBRACK    // ]
	RBRACE    // }
	SEMICOLON // ;
	COLON     // :
	operator_end

	keyword_beg
	// Keywords
	BREAK
	CASE
	CHAN
	CONST
	CONTINUE

	DEFAULT
	DEFER
	ELSE

		// done

	case *LParen:
		p.printf("(")
	case *RParen:
		p.printf(")")

	case *Line:
		p.tokens(x.Token)

	case *LineBlock:
		p.tokens(x.Token)
		p.printf(" ")
		p.expr(&x.LParen)
		p.margin++
		for _, l := range x.Line {
			p.newline()
			p.expr(l)
		}
		p.margin--
		p.newline()
		p.expr(&x.RParen)
	}

	// Queue end-of-line comments for printing when we

		Rparen token.Pos // position of ")"
	}

	// A CallExpr node represents an expression followed by an argument list.
	CallExpr struct {
		Fun      Expr      // function expression
		Lparen   token.Pos // position of "("
		Args     []Expr    // function arguments; or nil
		Ellipsis token.Pos // position of "..." (token.NoPos if there is no "...")
		Rparen   token.Pos // position of ")"
	}

		if paren {
			p.print(token.RPAREN)
		}

		p.setPos(x.Lparen)
		p.print(token.LPAREN)
		if x.Ellipsis.IsValid() {
			p.exprList(x.Lparen, x.Args, depth, 0, x.Ellipsis, false)
			p.setPos(x.Ellipsis)
			p.print(token.ELLIPSIS)
			if x.Rparen.IsValid() && p.lineFor(x.Ellipsis) < p.lineFor(x.Rparen) {
				p.print(token.COMMA, formfeed)
			}
		} else {

func dddErrPos(call *ast.CallExpr) positioner { return atPos(call.Ellipsis) }

// argErrPos returns positioner for reporting an invalid argument count.
func argErrPos(call *ast.CallExpr) positioner { return inNode(call, call.Rparen) }

// startPos returns the start position of node n.
func startPos(n ast.Node) token.Pos { return n.Pos() }

// endPos returns the position of the first character immediately after node n.

						pos := n.Args[0].Pos()
						fun := &ast.SelectorExpr{X: newIdent(pos, "posn"), Sel: newIdent(pos, "Pos")}
						arg := &ast.CallExpr{Fun: fun, Lparen: pos, Args: nil, Ellipsis: token.NoPos, Rparen: pos}
						n.Args[0] = arg
						return false
					}
				case "addf":
					// rewrite err.addf(pos, ...) to err.addf(posn, ...)
					if isIdent(n.Args[0], "pos") {
						pos := n.Args[0].Pos()