${THIS_SH} ./errors1.sub
${THIS_SH} ./errors2.sub
${THIS_SH} ./errors3.sub
+${THIS_SH} ./errors4.sub
+${THIS_SH} -o posix ./errors4.sub
+
+${THIS_SH} ./errors5.sub
+
+${THIS_SH} ./errors6.sub
+THIS_SH="${THIS_SH} -o posix" ${THIS_SH} ./errors6.sub
# this must be last!
# in posix mode, a function name must be a valid identifier