[
    Expression {
        expr: Infix {
            lhs: Variable {
                name: "a",
            },
            op: Assign,
            rhs: LiteralInteger {
                i: 4,
            },
        },
    },
    Expression {
        expr: Infix {
            lhs: Variable {
                name: "b",
            },
            op: Assign,
            rhs: Match {
                condition: Variable {
                    name: "a",
                },
                default: None,
                arms: [],
            },
        },
    },
]