syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"ty::Tuple(ts)"}]}
source_snippet:             ty::Tuple(ts) => ty::Tuple(ts.try_fold_with(folder)?),
context_before:             ),
context_after:             ty::FnDef(def_id, args) => ty::FnDef(def_id, args.try_fold_with(folder)?),