{"ast_node_type":"variable","tokens":[{"end":81,"kind":"keyword","start":0,"text":"let"}]}
        let generics_param_span = main_fn_generics_params_span(tcx, main_def_id);
    if main_fn_generics.count() != 0 || !main_fnsig.bound_vars().is_empty() {
        tcx.dcx().emit_err(errors::MainFunctionGenericParameters {