{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"source.set(ecx.characterize_param_env_assumption(goal.param_env,"}]}
                source.set(ecx.characterize_param_env_assumption(goal.param_env, assumption)?);
                ecx.try_evaluate_added_goals()?;
                ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)