{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"coherence::trait_ref_is_knowable(&**delegate,"}]}
        coherence::trait_ref_is_knowable(&**delegate, trait_ref, lazily_normalize_ty)
        let lazily_normalize_ty = |ty| self.structurally_normalize_ty(param_env, ty);
            .map(|is_knowable| is_knowable.is_ok())