=== modified file 'bin/confz'
--- bin/confz	2014-06-26 19:27:11 +0000
+++ bin/confz	2014-06-26 18:23:05 +0000
@@ -96,10 +96,6 @@
 	#   <variables> are variable assignments in the form of:
 	#       foo=bar  -- sets ${vars[foo]} in calee to value "bar"
 	#       :foo  -- passes ${vars[foo]} from caller to calee
-	#       ?foo=bar -- sets ${vars[foo]} in calee to value of ${vars[bar]}
-	#                   iff it is defined in the caller
-	#       ?foo -- passes ${vars[foo]} from caller to calee iff it is defined
-	#               in the caller
 	#       %foo  -- passes ${vars[foo]} from callee to caller
 	#       %foo=bar  -- passes ${vars[foo]} from callee
 	#                    to variable ${vars[bar]} of caller
@@ -123,12 +119,7 @@
 	# parse variable assignments
 	while (( $# )); do
 		case $1 in
-			(:*)   ((${+vars_prev[${1#:}]})) || \
-				die "variable ${(qqq)1#:} not set, passed as :argument"
-				setvar ${1#:} ${vars_prev[${1#:}]};;
-			(\?*=*) (($+vars_prev[${${1#\?}#*=})) && \
-				setvar ${${1#\?}%%=*} $vars_prev[${${1#\?}#*=};;
-			(\?*)  setvar ${1#\?} ${vars_prev[${1#\?}]};;
+			(:*)   setvar ${1#:} ${vars_prev[${1#:}]};;
 			(%*=*) lift[${${1#%}%%=*}]=${${1#%}#*=};;
 			(%*)   lift[${1#%}]=${1#%};;
 			(*=*)  setvar ${1%%=*} ${1#*=};;
@@ -194,8 +185,6 @@
 
 	# lift %variables from calee to caller
 	for outer inner in ${(kv)lift}; do
-		((${+vars_prev[$inner]})) || \
-			die "variable ${(qqq)inner} not set, was requested by caller as ${(qqq)outer}"
 		setvar $outer ${vars_prev[$inner]}
 	done
 }