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  foo($i++); # ok
  foo(++$i); # ok
  foo($i,$i++); # not ok
  foo($i++,$i); # not ok
  foo($i++,++$i); # WTF?

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  my $flubber = do {
    my @args;
...
    push @args, ++$i;
    foo(@args)
  }; # well defined: $_[1] == $_[0]+2