B20.1: bash getopts?

[Robert Story]

Environment: Cygwin 20.1 beta, WinNT 4.0 build 1381 sp 4

I'm trying to run a bash script which uses getopts under cygwin. The 
script works on my linux box, but reports 'getopts not found' under 
cygwin. The bash help list getopts as a valid built-in command. The 
script in question can be reduced to :

#/bin/bash
#
while getopts ab flag
do
	case "$flag" in
	a) echo "Flag a";;
	b) echo "Flag b";;
	?) echo "Flag unknown";;
	esac
done



I could not find any scripts in the bin directory that use getopts. 
Should it work? Or is the help incorrect?

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