Void cast
-----
<?php
(void)foo();
( VOID ) foo();
(void)$a or $b;

// This is explicitly allowed.
for ((void)a(); $b; (void)$c) {
}

// PHP does not allow this, but the parser accepts it.
$x = (void) $y;
-----
array(
    0: Stmt_Expression(
        expr: Expr_Cast_Void(
            expr: Expr_FuncCall(
                name: Name(
                    name: foo
                )
                args: array(
                )
            )
        )
    )
    1: Stmt_Expression(
        expr: Expr_Cast_Void(
            expr: Expr_FuncCall(
                name: Name(
                    name: foo
                )
                args: array(
                )
            )
        )
    )
    2: Stmt_Expression(
        expr: Expr_Cast_Void(
            expr: Expr_BinaryOp_LogicalOr(
                left: Expr_Variable(
                    name: a
                )
                right: Expr_Variable(
                    name: b
                )
            )
        )
    )
    3: Stmt_For(
        init: array(
            0: Expr_Cast_Void(
                expr: Expr_FuncCall(
                    name: Name(
                        name: a
                    )
                    args: array(
                    )
                )
            )
        )
        cond: array(
            0: Expr_Variable(
                name: b
            )
        )
        loop: array(
            0: Expr_Cast_Void(
                expr: Expr_Variable(
                    name: c
                )
            )
        )
        stmts: array(
        )
        comments: array(
            0: // This is explicitly allowed.
        )
    )
    4: Stmt_Expression(
        expr: Expr_Assign(
            var: Expr_Variable(
                name: x
            )
            expr: Expr_Cast_Void(
                expr: Expr_Variable(
                    name: y
                )
            )
        )
        comments: array(
            0: // PHP does not allow this, but the parser accepts it.
        )
    )
)