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# in 5.005_02
$x = (1,2,3)[10];  # $x is undef
...
$x = (1,2,3)[10];  # $x is undef
@x = (1,2,3)[10];  # @x is (), not (undef)
@x = (undef)[0];   # @x is (undef), not ()

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# returns the collapsed list: 15 chars
#             123456789_12345
...
# modifies array ref elements in place: 26 chars
#             123456789_123456789_123456
sub collapse {@$_=grep{defined}@{$_=pop}}