{"ast_node_type":"variable","tokens":[{"end":64,"kind":"keyword","start":0,"text":"let"}]}
                    let fn_ty = bx.fn_decl_backend_type(fn_abi);
                    let fn_abi = bx.fn_abi_of_instance(instance, ty::List::empty());
                    let fn_attrs = if bx.tcx().def_kind(instance.def_id()).has_codegen_attrs() {