{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"ecx.eq(self.param_env,"}]}
                    ecx.eq(self.param_env, source_projection.projection_term, target_projection)?;
                    let source_projection = ecx.instantiate_binder_with_infer(source_projection);
                    ecx.try_evaluate_added_goals()