syntax_data: {"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":")"}]}
source_snippet: ) -> SmallVec<[Ty<'tcx>; 4]> {
context_before:     ty_seen: &mut UnordSet<Ty<'tcx>>,
context_after:     // Droppiness does not depend on regions, so let us erase them.