=== modified file 'bin/confz'
--- bin/confz	2014-06-26 19:35:15 +0000
+++ bin/confz	2014-06-26 19:27:11 +0000
@@ -128,8 +128,7 @@
 				setvar ${1#:} ${vars_prev[${1#:}]};;
 			(\?*=*) (($+vars_prev[${${1#\?}#*=})) && \
 				setvar ${${1#\?}%%=*} $vars_prev[${${1#\?}#*=};;
-			(\?*)  ((${+vars_prev[${1#\?}]})) && \
-				setvar ${1#\?} ${vars_prev[${1#\?}]};;
+			(\?*)  setvar ${1#\?} ${vars_prev[${1#\?}]};;
 			(%*=*) lift[${${1#%}%%=*}]=${${1#%}#*=};;
 			(%*)   lift[${1#%}]=${1#%};;
 			(*=*)  setvar ${1%%=*} ${1#*=};;