syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"Ty::new_fn_def(tcx,"}]}
source_snippet:         Ty::new_fn_def(tcx, tcx.require_lang_item(LangItem::PinNewUnchecked, span), [fut_ref_ty]);
context_before:     let pin_fut_new_unchecked_fn =
context_after:     let fut_pin_ty = pin_fut_new_unchecked_fn.fn_sig(tcx).output().skip_binder();