Many funcs should return bool success/failure flag and result value
for sucess (and undefined for failure). Mutiple return would excellet
for this purpose:

ret_code, func_result:= superpuperfunc(..);
if ret_code then func_result:= ...;

With the VAR approch it looks ugly :

if superpuperfunc(..,func_result) then..
  func_result:=  ..

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