f=$(if $2,$(call g,$(call f,$1,$3,$4,$5,),$(call f,$($2),$3,$4,$5,)),$1)
g=$1$2$1
1=-
2=1
3=1
4=1
5=1
s=$  
$(foreach i,2 3 4 5 6,$(info $f)$(eval $i=s))