perlquestion liz [Aristotle]'s answer to [id://314423] made me find the following phenomenon: <code> $a = [[0]]; foreach (@$a) { $_++ foreach @$_ } print $a->[0][0],$/; $_++ for map @$_, @{$a}; print $a->[0][0],$/; __END__ 1 1 </code> The expected output is: <code> 1 2 </code> The strange thing is that the extra list flattening with map() doesn't work. I don't see any reason why it shouldn't. I guess the question is: is this a bug or not? <P> Liz <P> <B>Update</B>:<BR> Not a bug, just copying of the list with map(). Thanks to [!1], [blokhead] and [holo] for the enlightenment.