{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"s.add_impl_generic(parse_quote!"}]}
    s.add_impl_generic(parse_quote! { #decoder_ty: ::rustc_serialize::Decoder });
    let decoder_ty = quote! { __D };
    s.add_bounds(synstructure::AddBounds::Fields);