rust/tests/ui/author.stdout

if_chain! {
    if let StmtKind::Decl(ref decl, _) = stmt.node
    if let DeclKind::Local(ref local) = decl.node;
    if let Some(ref init) = local.init
    if let ExprKind::Cast(ref expr, ref cast_ty) = init.node;
    if let TyKind::Path(ref qp) = cast_ty.node;
    if match_qpath(qp, &["char"]);
    if let ExprKind::Lit(ref lit) = expr.node;
    if let LitKind::Int(69, _) = lit.node;
    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name, None) = local.pat.node;
    if name.node.as_str() == "x";
    then {
        // report your lint here
    }
}