env:  Win XP, perl 5.12.3, 512M memory available: 350M

C:\>perl -e "@a = (1..1_000_000_000_000);"
Range iterator outside integer range at -e line 1.  # of course!

C:\>perl -e "@a = (1..1_000_000_000);"
Out of memory!          # fair enough ;)

C:\>perl -e "@a = (1..9_000_000);"
Terminating on signal SIGINT(2)  #took too long time, and I have to kill it :(