syntax_data: {"ast_node_type":"other","tokens":[{"end":110,"kind":"keyword","start":0,"text":"impl<I:"}]}
source_snippet:             impl<I: Interner, D: rustc_serialize::Decoder> rustc_serialize::Decodable<D> for ty::Binder<I, $t>
context_before:             }
context_after:             where