https://bugzilla.redhat.com/show_bug.cgi?id=2055608
Jitka Plesnikova jplesnik@redhat.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |NOTABUG Doc Type|--- |If docs needed, set a value Status|NEW |CLOSED Last Closed| |2022-02-17 11:42:53
--- Comment #1 from Jitka Plesnikova jplesnik@redhat.com --- This behavior is describe in perldoc for 'exists':
Note that the EXPR can be arbitrarily complicated as long as the final operation is a hash or array key lookup or subroutine name:
if (exists $ref->{A}->{B}->{$key}) { } if (exists $hash{A}{B}{$key}) { }
if (exists $ref->{A}->{B}->[$ix]) { } if (exists $hash{A}{B}[$ix]) { }
if (exists &{$ref->{A}{B}{$key}}) { }
Although the most deeply nested array or hash element will not spring into existence just because its existence was tested, any intervening ones will. Thus "$ref->{"A"}" and "$ref->{"A"}->{"B"}" will spring into existence due to the existence test for the $key element above. This happens anywhere the arrow operator is used, including even here:
undef $ref; if (exists $ref->{"Some key"}) { } print $ref; # prints HASH(0x80d3d5c)