{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"add_impl_block(impl_generics.clone(),"}]}
    add_impl_block(impl_generics.clone(), sym::DispatchFromDyn, gen_args.clone());
    let gen_args = vec![GenericArg::Type(alt_self_type)];
    add_impl_block(impl_generics.clone(), sym::CoerceUnsized, gen_args);