rust/tests/ui/author.stdout

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