{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"Some((prior_arm_block_id,"}]}
                Some((prior_arm_block_id, prior_arm_ty, prior_arm_span)) => {
                None => ObligationCauseCode::BlockTailExpression(arm.body.hir_id, match_src),
                    ObligationCauseCode::MatchExpressionArm(Box::new(MatchExpressionArmCause {