syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"UnsafeBinderInner(ty::Binder::bind_with_vars("}]}
source_snippet:         UnsafeBinderInner(ty::Binder::bind_with_vars(
context_before:         let bound_vars = rustc_serialize::Decodable::decode(decoder);
context_after:             rustc_serialize::Decodable::decode(decoder),