+ <catch><symbol>tag</symbol>
+ <funcall fname="looptest">
+ <list>
+ <set vname="i"><integer>0</integer></set>
+ <throw><symbol>tag</symbol><symbol>returned</symbol></throw>
+ <add vname="i"><integer>1</integer></add>
+ <varref vname="i"/>
+ </list>
+ </funcall>
+ </catch>