Re^7: Array dereference in foreach()

Note that $a gets autovivified into [] after for (@$a) -- that's because for creates a special context similar to lvalue (as its list's elements are aliased to the loop variable).

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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Re^8: Array dereference in foreach() by pme (Monsignor) on Nov 16, 2017 at 12:55 UTC
What is this "special context similar to lvalue"? Is there any difference to usual lvalue other than not throwing exception in case of array-dereferencing undef? However it is not special enough to work smoothly with dereferencing undef as hashref. This one throws exception. `my $a; foreach (keys %$a) { print "$_\n"; }` [download]	[reply] [d/l]
Re^9: Array dereference in foreach() by choroba (Cardinal) on Nov 16, 2017 at 12:59 UTC
keys doesn't propagate the outer context to its argument. `#!/usr/bin/perl use strict; use warnings; my $x; 1 for %$x; print $x, "\n"; # HASH(0x26a18cd)` [download] ($q=q:Sq=~/;[c](.)(.)/;chr(-\|\|-\|5+lengthSq)`"S\|oS2"`map{chr \|+ord }map{substrSq`S_+\|`\|}3E\|-\|`7**2-3:)=~y+S\|`+$1,++print+eval$q,q,a, [download]	[reply] [d/l] [select]
Re^10: Array dereference in foreach() by pme (Monsignor) on Nov 16, 2017 at 13:03 UTC
I suspected that based on haukex comment below. Thank you guys!	[reply]