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       If any part of LIST is an array, "foreach" will get very confus
+ed if
       you add or remove elements within the loop body, for example wi
+th
       "splice".   So don’t do that.

  @foo = map { 'd' eq $_ ? ($_,'h') : $_ } @foo;
  # puts 'h' right after 'd'

my @extras;
foreach my $x (@foo) {
...
# didn't print 'h'.  But if we add:
print foreach @extras;
# that works ... but duplicates code.

{
  my @extras;
...
{
  print $x;
}