Neat trick indeed! When I read your post I immediatly thought about a problem I had a few weeks ago where I wished such a construct existed (BEGIN worked alright, but it makes the command a bit long and I like them to fit on one line :) ). Turns out my problem is exactly the one mentioned in the linked post. And Discipulus has a good point about being able to glob your arguments :)

I was a little confused by the deparsed code because the print 'foo' doesn't come right after the 5; But it's just that -M'5; print "foo"' is actually turned into use 5; print 'foo'; and the first statement is turned into an equivalent BEGIN + require block :)

It also works if you are already including a module without parameters 

perl -MO=Deparse -M"Data::Dump; print 'Hi'" -ne ""
use Data::Dump;
print 'Hi';
LINE: while (defined($_ = readline ARGV)) {
    ();
}
-e syntax OK

[download]
It technically works with strict, but if you're going to use that kind of constructs you probably don't need strictures :P

Also, if you want to say something in that BEGIN-like code, since the feature would only be added by -E after the inserted code, you'll have to do something like: -M'v5.10; say "just saying"'

Edit: who needs O::Deparse anyway? 

perl -M"5.01;say q&" -Mstrict -anE " print 'Hi'; }&;{"
;use strict;use feature ':5.26';LINE: while (<>) {our @F=split(' ');
 print 'Hi'; }

[download]

In reply to Re: Inserting Code Before an -n/-p Loop by Eily
in thread Inserting Code Before an -n/-p Loop by haukex

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