X   Expr  // X.(type)
		expr
	}

	Operation struct {
		Op   Operator
		X, Y Expr // Y == nil means unary expression
		expr
	}

	// Fun(ArgList[0], ArgList[1], ...)
	CallExpr struct {
		Fun     Expr
		ArgList []Expr // nil means no arguments
		HasDots bool   // last argument is followed by ...
		expr
	}

	// ElemList[0], ElemList[1], ...
	ListExpr struct {
		ElemList []Expr

		return ".long 0x0"
	} else if inst.Op == 0 {
		return "error: unknown instruction"
	}

	PC := pc
	// Special handling for some ops
	startArg := 0
	sep := " "
	opName := inst.Op.String()
	argList := inst.Args[:]

	switch opName {
	case "bc", "bcl", "bca", "bcla", "bclr", "bclrl", "bcctr", "bcctrl", "bctar", "bctarl":
		sfx := inst.Op.String()[2:]
		bo := int(inst.Args[0].(Imm))
		bi := inst.Args[1].(CondReg)

				op := *x
				op.X = lhs
				return name, &op
			}
		}
	case *CallExpr:
		if name, _ := x.Fun.(*Name); name != nil {
			if len(x.ArgList) == 1 && !x.HasDots && (force || isTypeElem(x.ArgList[0])) {
				// x = name "(" x.ArgList[0] ")"
				return name, x.ArgList[0]
			}
		}
	}
	return nil, x
}

// isTypeElem reports whether x is a (possibly parenthesized) type element expression.

		case *AssertExpr:
			m = n.Type
		case *TypeSwitchGuard:
			m = n.X
		case *Operation:
			if n.Y != nil {
				m = n.Y
				continue
			}
			m = n.X
		case *CallExpr:
			if l := lastExpr(n.ArgList); l != nil {
				m = l
				continue
			}
			m = n.Fun
		case *ListExpr:
			if l := lastExpr(n.ElemList); l != nil {
				m = l
				continue
			}
			return n.Pos()

		// types

		if n.Lhs != nil {
			w.node(n.Lhs)
		}
		w.node(n.X)

	case *Operation:
		w.node(n.X)
		if n.Y != nil {
			w.node(n.Y)
		}

	case *CallExpr:
		w.node(n.Fun)
		w.exprList(n.ArgList)

	case *ListExpr:
		w.exprList(n.ElemList)

	// types
	case *ArrayType:
		if n.Len != nil {
			w.node(n.Len)
		}
		w.node(n.Elem)

	case *SliceType:
		w.node(n.Elem)

	"api_predicates.go": nil,
	"basic.go":          nil,
	"builtins.go": func(f *ast.File) {
		renameImportPath(f, `"cmd/compile/internal/syntax"->"go/ast"`)
		renameIdents(f, "syntax->ast")
		renameSelectors(f, "ArgList->Args")
		fixSelValue(f)
		fixAtPosCall(f)
	},
	"builtins_test.go": func(f *ast.File) {
		renameImportPath(f, `"cmd/compile/internal/syntax"->"go/ast"`, `"cmd/compile/internal/types2"->"go/types"`)

	if ftyp.Results().Len() != 1 {
		base.Fatalf("invalid typecheck of range func")
	}

	// Build X(bodyFunc)
	call := &syntax.ExprStmt{
		X: &syntax.CallExpr{
			Fun: rclause.X,
			ArgList: []syntax.Expr{
				r.bodyFunc(nfor.Body.List, syntax.UnpackListExpr(rclause.Lhs), rclause.Def, ftyp, start, end),
			},
		},
	}
	setPos(call, start)

	// Build checks based on #next after X(bodyFunc)

	case *TypeSwitchGuard:
		if n.Lhs != nil {
			p.print(n.Lhs, blank, _Define, blank)
		}
		p.print(n.X, _Dot, _Lparen, _Type, _Rparen)

	case *CallExpr:
		p.print(n.Fun, _Lparen)
		p.printExprList(n.ArgList)
		if n.HasDots {
			p.print(_DotDotDot)
		}
		p.print(_Rparen)

	case *Operation:
		if n.Y == nil {
			// unary expr
			p.print(n.Op)
			// if n.Op == lexical.Range {
			// 	p.print(blank)

			}
		}
	case *ast.CallExpr:
		if name, _ := x.Fun.(*ast.Ident); name != nil {
			if len(x.Args) == 1 && x.Ellipsis == token.NoPos && (force || isTypeElem(x.Args[0])) {
				// x = name "(" x.ArgList[0] ")"
				return name, x.Args[0]
			}
		}
	}
	return nil, x
}

// isTypeElem reports whether x is a (possibly parenthesized) type element expression.

			result.combine(arg.analyze(s))
		}
		return result

	case sqlFnCharLength, sqlFnCharacterLength:
		if len(e.SFunc.ArgsList) != 1 {
			return qProp{err: fmt.Errorf("%s needs exactly 2 arguments", string(funcName))}
		}
		for _, arg := range e.SFunc.ArgsList {
			result.combine(arg.analyze(s))
		}
		return result

	case sqlFnLower, sqlFnUpper:
		if len(e.SFunc.ArgsList) != 1 {