rust/tests/ui/author.stdout

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