[
    Expression {
        expr: Infix {
            lhs: Variable {
                name: "foo",
            },
            op: Assign,
            rhs: Include {
                kind: Require,
                path: Infix {
                    lhs: MagicConst {
                        constant: Dir,
                    },
                    op: Concat,
                    rhs: LiteralString {
                        value: "/foo.php",
                    },
                },
            },
        },
    },
]