{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"CandidateSource::BuiltinImpl(BuiltinImplSource::Trivial),"}]}
            CandidateSource::BuiltinImpl(BuiltinImplSource::Trivial),
        ecx.probe_and_evaluate_goal_for_constituent_tys(
            goal,