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function [vnms,vtps,stk,txt]=get_unknown(nam)
// handle case where nam appear in an expression while it is not known.
// nam is unknown here, it may be:
// - variable created in an other clause part
// - an m-file called without args
// - a variable created by an eval
vnms;vtps;stk;txt;
// check clause
if level(1)>1 then // in a clause
k_n=find(vnms_n(:,2)==nam)
if k_n<>[] // variable has been defined in an other clause part
stk(top)=list(nam,'0',vtps_n(k_n)(2),vtps_n(k_n)(3),vtps_n(k_n)(1))
vnms=[vnms;[nam,nam]]
vtps($+1)=vtps_n(k_n)
return
end
end
// check for following assignments [x,..]=nam
lhs=0
il=ilst+1
nlst=size(lst)
while il<=nlst
if lst(il)(1)<>'1' then break,end
lhs=lhs+1
il=il+1
end
// check if instruction is simply "nam" (nam=nam)
if lhs<>0 then
if lhs==1 then
if lst(ilst+1)(2)==nam then
// instruction is simply "nam". suppose it is an m-file call
stk(top)=list()
return
end
else
// at least two lhs --> a m_file call
stk(top)=list()
return
end
end
if or(nam==known_untranslated()) then
stk(top)=list()
return
end
//I am not able to determine what is nam
set_infos('mtlb('+nam+') can be replaced by '+nam+'() or '+nam+' whether '+nam+..
' is an m-file or not',1)
stk(top)=list('mtlb('+nam+')','0','?','?','?')
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