syntax_data: {"ast_node_type":"other","tokens":[{"end":17,"kind":"keyword","start":0,"text":"where"}]}
source_snippet:             where
context_before:             impl<I: Interner, D: rustc_serialize::Decoder> rustc_serialize::Decodable<D> for ty::Binder<I, $t>
context_after:                 $t: TypeVisitable<I> + rustc_serialize::Decodable<D>,