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Assigning new by reference (PHP 5 only)
-----
<?php
$a =& new B;
-----
!!php5
array(
    0: Stmt_Expression(
        expr: Expr_AssignRef(
            var: Expr_Variable(
                name: a
            )
            expr: Expr_New(
                class: Name(
                    parts: array(
                        0: B
                    )
                )
                args: array(
                )
            )
        )
    )
)
-----
<?php
$a =& new B;
-----
!!php7
Syntax error, unexpected T_NEW from 2:7 to 2:9
array(
    0: Stmt_Expression(
        expr: Expr_New(
            class: Name(
                parts: array(
                    0: B
                )
            )
            args: array(
            )
        )
    )
)