: ${THIS_SH:=./bash}

# all parse errors
${THIS_SH} -c '[[ ( -n xx' bash
${THIS_SH} -c '[[ ( -n xx )' bash

${THIS_SH} -c '[[ ( -t X ) ]' bash

${THIS_SH} -c '[[ -n &' bash
${THIS_SH} -c '[[ -n XX &' bash
${THIS_SH} -c '[[ -n XX & ]' bash

${THIS_SH} -c '[[ 4 & ]]' bash
${THIS_SH} -c '[[ 4 > & ]]' bash

${THIS_SH} -c '[[ & ]]' bash
${THIS_SH} -c '[[ -Q 7 ]]' bash
${THIS_SH} -c '[[ -n < ]]' bash

# let's see what failed cond commands do with ERR trap
trap 'echo ERR: $LINENO: -$BASH_COMMAND- failed' ERR
[[ -n $unset ]]

func()
{
	[[ -z nonempty ]]
}
func