# Consider a subroutine with a 1-to-1
  # argument to return length mapping.
  my ($a) = foo($bar); # OK
  my  $a  = foo($bar); # OK

  my ($a) = foo($bar, $baz); # OK
  my  $a  = foo($bar, $baz); # Warns.
  # Why did the programmer pass two arguments
  # if he just wanted one return value?