lets make somthing creative..

/test {
var %m = $lines(t.txt),%i = 1
fopen t t.txt
while (%i <= %m) {
var %l = $fread(t)
echo -s %i = %l
goto finish
:error
echo -s line too long: %i
:finish
inc %i
}
fclose t
return
}

goes to:
/test {
var %m = $lines(t.txt),%i = 1
fopen t t.txt
:loop
while (%i <= %m) {
var %l = $fread(t)
echo -s %i = %l
inc %i
}
goto close
:error
echo -a Error: /var line to long: %1
goto loop
:close
fclose t
return
}