if_chain! {
    if let StmtKind::Local(ref local) = stmt.kind;
    if let Some(ref init) = local.init;
    if let ExprKind::Match(ref expr, ref arms, MatchSource::Normal) = init.kind;
    if let ExprKind::Lit(ref lit) = expr.kind;
    if let LitKind::Int(42, _) = lit.node;
    if arms.len() == 3;
    if let ExprKind::Lit(ref lit1) = arms[0].body.kind;
    if let LitKind::Int(5, _) = lit1.node;
    if let PatKind::Lit(ref lit_expr) = arms[0].pat.kind
    if let ExprKind::Lit(ref lit2) = lit_expr.kind;
    if let LitKind::Int(16, _) = lit2.node;
    if let ExprKind::Block(ref block) = arms[1].body.kind;
    if let Some(trailing_expr) = &block.expr;
    if block.stmts.len() == 1;
    if let StmtKind::Local(ref local1) = block.stmts[0].kind;
    if let Some(ref init1) = local1.init;
    if let ExprKind::Lit(ref lit3) = init1.kind;
    if let LitKind::Int(3, _) = lit3.node;
    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name, None) = local1.pat.kind;
    if name.as_str() == "x";
    if let PatKind::Lit(ref lit_expr1) = arms[1].pat.kind
    if let ExprKind::Lit(ref lit4) = lit_expr1.kind;
    if let LitKind::Int(17, _) = lit4.node;
    if let ExprKind::Lit(ref lit5) = arms[2].body.kind;
    if let LitKind::Int(1, _) = lit5.node;
    if let PatKind::Wild = arms[2].pat.kind;
    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name1, None) = local.pat.kind;
    if name1.as_str() == "a";
    then {
        // report your lint here
    }
}