if_chain! {
    if let ExprKind::Binary(ref op, ref left, ref right) = expr.node;
    if BinOpKind::Eq == op.node;
    if let ExprKind::Binary(ref op1, ref left1, ref right1) = left.node;
    if BinOpKind::BitAnd == op1.node;
    if let ExprKind::Path(ref path) = left1.node;
    if match_qpath(path, &["x"]);
    if let ExprKind::Lit(ref lit) = right1.node;
    if let LitKind::Int(15, _) = lit.node;
    if let ExprKind::Lit(ref lit1) = right.node;
    if let LitKind::Int(0, _) = lit1.node;
    then {
        // report your lint here
    }
}