switch t.Underlying().(type) {
		case *types.Pointer, *types.Interface, *types.TypeParam:
			return
		}

		switch argidx {
		case 0:
			pass.Reportf(call.Lparen, "call of %s passes non-pointer", fn.Name())
		case 1:
			pass.Reportf(call.Lparen, "call of %s passes non-pointer as second argument", fn.Name())
		}
	})
	return nil, nil

//	)
type LineBlock struct {
	Comments
	Start  Position
	LParen LParen
	Token  []string
	Line   []*Line
	RParen RParen
}

func (x *LineBlock) Span() (start, end Position) {
	return x.Start, x.RParen.Pos.add(")")
}

// An LParen represents the beginning of a parenthesized line block.
// It is a place to store suffix comments.
type LParen struct {
	Comments
	Pos Position
}

	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 {

	case token.MAP:
		return p.parseMapType()
	case token.CHAN, token.ARROW:
		return p.parseChanType()
	case token.LPAREN:
		lparen := p.pos
		p.next()
		typ := p.parseType()
		rparen := p.expect(token.RPAREN)
		return &ast.ParenExpr{Lparen: lparen, X: typ, Rparen: rparen}
	}

	// no type found
	return nil
}

			children = append(children,
				tok(n.Func, len("func")))
		}

	case *ast.GenDecl:
		children = append(children,
			tok(n.TokPos, len(n.Tok.String())))
		if n.Lparen != 0 {
			children = append(children,
				tok(n.Lparen, len("(")),
				tok(n.Rparen, len(")")))
		}

	case *ast.GoStmt:
		children = append(children,
			tok(n.Go, len("go")))

	case *ast.Ident:
		children = append(children,

	INC   // ++
	DEC   // --

	EQL    // ==
	LSS    // <
	GTR    // >
	ASSIGN // =
	NOT    // !

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

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

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

	keyword_beg
	// Keywords
	BREAK

	default:
		panic(fmt.Errorf("printer: unexpected type %T", x))

	case *CommentBlock:
		// 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()

				if stringMethods[fn.Name()] {
					pass.Reportf(call.Lparen, "result of (%s).%s call not used",
						sig.Recv().Type(), fn.Name())
				}
			}
		} else {
			// package-level function (e.g. fmt.Errorf)
			if pkgFuncs[[2]string{fn.Pkg().Path(), fn.Name()}] {
				pass.Reportf(call.Lparen, "result of %s.%s call not used",
					fn.Pkg().Path(), fn.Name())
			}
		}
	})

		case *ast.ChanType:
			paren = t.Dir == ast.RECV
		}
		if paren {
			p.print(token.LPAREN)
		}
		wasIndented := p.possibleSelectorExpr(x.Fun, token.HighestPrec, depth)
		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 isIdent(n.Args[0], "pos") {
						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") {