Re^2: Strange behaviour of interpreter when dereferencing an undefined value

[kejv2]

I can't see how this could be related to my examples since in

perl -we'use strict; sub foo {}; my $a; foo( %{ $a } )'

the expression %{ $a } isn't in lvalue context. Also autovivification doesn't appear only in lvalue context:

perl -MData::Dumper -we'use strict; my $a; $a->{b}{c}; print Dumper $a
+'
$VAR1 = {
          'b' => {}
        };

[ikegami]

the expression %{ $a } isn't in lvalue context.

Yes, it is.

$ perl -E'sub f { $_[0] = 'abc' }  f($x); say $x'
abc

$ perl -E'sub f { $_[1] = 'abc' }  $h{a}=undef; f(%h); say $h{a}'
abc

Perl arguments are always passed by reference.

Also autovivification doesn't appear only in lvalue context

I didn't say otherwise.