{"ast_node_type":"impl","tokens":[{"end":82,"kind":"keyword","start":0,"text":"generics:"}]}
    generics: impl FnOnce(&CodegenCx<'ll, 'tcx>) -> SmallVec<Option<&'ll DIType>>,
    members: impl FnOnce(&CodegenCx<'ll, 'tcx>, &'ll DIType) -> SmallVec<&'ll DIType>,
) -> DINodeCreationResult<'ll> {