In fact you have hit on the classic way that you extend a functional system. Instead of passing around more information or creating global data, just move that action into creating a closure which binds the arguments up front for later use.

For an example with many of these closures running around in parallel, see Re (tilly) 1: 5x5 Puzzle. (Look specifically at ret_toggle_square.) And a more general form of your make_wanted function would be: 

# Takes an anon function and a list of arguments.  Returns
# a closure which will call the anon function with those
# arguments prepended to the argument list.
sub bind_args {
  my ($sub, @args) = @_;
  return sub {$sub->(@args, @_);};
}

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In reply to Re (tilly) 1: Why I hate File::Find and how I (hope I) fixed it by tilly
in thread Why I hate File::Find and how I (hope I) fixed it by mirod

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