Ah, I'm always forgetting this.

But underneath, is there a chance at some kind of return value optimization? Say if you have... 

sub1 {
...
   return @a;
}

$r = [sub1];

[download]
Even if it's officially turning the values of @a into a list en route to copying them into the array that the brackets create a reference to, could perl not notice @a is no longer needed otherwise and instead simply make [sub1] be \@a behind the scenes? It would be neat if you could write sub1 that way instead of making it return \@a even if you anticipated the copy to be expensive.

In reply to Re^4: on the fly reference to subroutine output by thirdm
in thread on the fly reference to subroutine output by ISAI student

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