syntax_data: {"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"ty::Binder::dummy(tys.last().map_or_else(Vec::new,"}]}
source_snippet:                 ty::Binder::dummy(tys.last().map_or_else(Vec::new, |&last| vec![last]))
context_before:             ty::Tuple(tys) => {
context_after:             }