Nifty perl trick I learned about todayyesterday

[pauamma]

Context was someone asking why

print "Hello, world!\n" && die;

doesn't output anything. Someone replied with a nifty trick to help figure this out:

perl -MO=Deparse -e 'print "Hello, world!\n" && die;'

or

perl -MO=Deparse,-p -e 'print "Hello, world!\n" && die;'

(go ahead and try it).

Note: -p won't make a difference here, but it helps if you suspect perl's notion of operator priorities is different from yours.

(crossposted from http://dw-dev-training.dreamwidth.org/23661.html at pne's suggestion)