Looks to me like the first candidate is a !~~ operator (or maybe a change to the behaviour table of ~~). Due to all the magic in the ~~ operator, $a !~~ $b is (well would not be) not the same thing as !($a ~~ $b). Let's have a look at what does the ~~ mean in case $a is an array and $b is a regexp: 

  @ARGV ~~ /\.mdb$/i

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What does that mean? Is it true if ANY of the elements in the array match the regexp or if ALL match? According to the docs @ARRAY ~~ $regexp is equivalent to grep /$regexp/, @ARRAY. Which means that statement above is true if ANY of the parameters matches the regexp (ends with .mdb).

Ok, but how do I make sure all are? How do we rewrite: 

if (grep { not /\.mdb$/i } @ARGV) {
  print STDERR "All parameters must be MDB files\n";
  exit;
}

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with the cool new ~~ if 
@ARGV ~~ /\.mdb\z/
   or die "All parameters must be MDB files"

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doesn't cut it? And 
@ARGV ~~ sub {$_[0] !~ /\.mdb$/i}
   and die "All parameters must be MDB files"

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according to the docs doesn't work? (According to the docs @ARRAY ~~ $sub is $sub->(@ARRAY) not grep {$sub->($_)} @ARRAY)

With !~~ it would be easy: 

@ARGV !~~ /\.mdb$/i
   and die "All parameters must be MDB files";

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And 

given($foo) {
  when (! /some regexp/) {...}
  ...
}

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or maybe 
given($foo) {
  when ! (/some regexp/) {...}
  ...
}

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would also come in handy.

Jenda
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In reply to What's missing in Perl 5.10 by Jenda

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