syntax_data: {"ast_node_type":"other","tokens":[{"end":19,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> Ty<'tcx> {
context_before:         mutbl: ty::Mutability,
context_after:         let pin = tcx.adt_def(tcx.require_lang_item(LangItem::Pin, DUMMY_SP));