syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"Ty::new_adt(tcx,"}]}
source_snippet:                 Ty::new_adt(tcx, option_adt_ref, option_args)
context_before:                 let option_args = tcx.mk_args(&[old_yield_ty.into()]);
context_after:             }