syntax_data: {"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> NeedsDropResult<Vec<Ty<'tcx>>> {
context_before:         iter: impl IntoIterator<Item = Ty<'tcx>>,
context_after:         iter.into_iter().try_fold(Vec::new(), |mut vec, subty| {