yang utils not finding trailing garbage error

i gave 1 extra curly braces. pyang thorwing error. but yang utils build success

typedef type2 {
type string {
length "1..253";
pattern
'(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.)

([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])/(([0-9])|([1-2][0-9])|(3[0-2]))';
}
}

}

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.818 s
[INFO] Finished at: 2016-05-19T17:15:07+05:30
[INFO] Final Memory: 37M/482M
[INFO] ------------------------------------------------------------------------
0
/home/root1/yang_automation/yang
/home/root1/onos/utils/test/src/main/yang
missed_states.yang

pyang output:
/home/root1/onos/utils/test/src/main/yang/missed_states.yang:47: error: trailing garbage after module