{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"fn_val:"}]}
        fn_val: FnVal<'tcx, M::ExtraFnVal>,
        &mut self,
        (caller_abi, caller_fn_abi): (ExternAbi, &FnAbi<'tcx, Ty<'tcx>>),