Setting variable inside loop after it is read is declared as unused

[triwav]

Take the example

myValue = initialValue
while true
  if myValue = invalid
    exit while
  else if otherStuff
  end if

  myValue = getValue()
end while

the line myValue = getValue() will be declared as unused when it will be used during the next loop.

[elsassph]

Right, we have the same problem with goto loops.

[elsassph]

duplicate of #66