each is inherently fragile since it uses an iterator you don't control. That's why I prefer using keys. 

for my $key ( keys %some_hash ) {
   my $val = $some_hash{$key};
   ...
}

[download]

For example, each doesn't work with last or die. 

>perl -le"%h=qw(a ! b @); for(1..2){ for$k(keys%h){ print ++$i,$k; las
+t } }"
1a
2a

>perl -le"%h=qw(a ! b @); for(1..2){ while($k=each%h){ print ++$i,$k; 
+last } }"
1a
2b  <-- b???

[download]

Update: Added example.

In reply to Re: Infinite loop with each by ikegami
in thread Infinite loop with each by Kursad

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