Same as yours, but cut out unnecessary space and get rid of the END block:
# 1 2 3 4
#23456789012345678901234567890123456789012345
perl -lne'$a[$.].=$_;$.=0if eof}{print for@a'
BTW, perldoc perlvar says:
$. is reset when the filehandle is closed, but not when an open
filehandle is reopened without an intervening close(). For
more details, see "I/O Operators" in perlop. Because "<>"
never does an explicit close, line numbers increase across ARGV
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