get length of argument list first, and then apply dynamic rule
get length of argument list first, and then apply dynamic rule

svn path=/trunk/StrategoXT/; revision=11949

lichtemo/strategoxt,lichtemo/strategoxt,Apanatshka/strategoxt,metaborg/strategoxt,metaborg/strategoxt,Apanatshka/strategoxt,Apanatshka/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt,metaborg/strategoxt,metaborg/strategoxt,lichtemo/strategoxt,Apanatshka/strategoxt,metaborg/strategoxt,lichtemo/strategoxt