syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"I::BoundVarKinds:"}]}
source_snippet:                 I::BoundVarKinds: rustc_serialize::Encodable<E>,
context_before:                 $t: rustc_serialize::Encodable<E>,
context_after:             {