Re^2: unexpected modify hash in a distance with grep { $

Replies are listed 'Best First'.
Re^3: unexpected modify hash in a distance with grep { $_ } by LanX (Saint) on Dec 20, 2019 at 18:41 UTC
> My educated guess is that it's because autovivification generally happens in an lvalue context. Good guess, but I can't see lvalue in these inconsistent results when aliasing: Re^2: unexpected modify hash in a distance with grep { $_ } (inconsistent behaviour of aliasing) edit My educated guess is rather that dave_the_m will digg into the sources now and point us to a (known?) glitch! ;-) Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply]
Re^3: unexpected modify hash in a distance with grep { $_ } by LanX (Saint) on Dec 20, 2019 at 22:47 UTC
Found another related discussion, curiously from the same OP. No autovivification, for loop aliasing, lvalue vs rvalue in for loops The related bug report argues, that aliases must trigger autovivification beforehand, in case an lvalue happens after. https://github.com/Perl/perl5/issues/15583 I find this explanation unsatisfactory because I showed here that the aliasing of sub arguments don't trigger autovivification. Hmm??? Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply]