Suppose %h is a HoH. Then @h{@a} is a hash slice. Is there a syntax for what is suggested by the (currently unrecognized) expression @h{@a}{@b}?

Code that computes what I'm trying to describe: 

my @list;
for my $a (@a) {
  for my $b (@b) {
    push(@list, $h{$a}{$b});
  }
}
# return @list;

[download]
If not for a general list @b, how about if @b contains just a single element:

@h{@a}{$x} ≡ map { $_->{$x} } @h{@a}

In reply to chained hash slices? by pc88mxer

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