{"ast_node_type":"variable","tokens":[{"end":48,"kind":"keyword","start":0,"text":"if"}]}
    if let hir::ExprKind::Lit(lit) = &arg.kind {
fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tcx hir::Expr<'tcx>) {
        if let ast::LitKind::Str(sym, _) = lit.node {