I want to process the token stream generated from PPI. So I want to enumerate and store each of its token types.

Maybe you can enumerate them lazily as you encounter them? Something along these lines: 

use Memoize qw(memoize);
memoize qw(number_for_class);
sub number_for_class { state $i; return ++$i };

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In reply to Re^3: getting a list of all subclasses of base class x by moritz
in thread getting a list of all subclasses of base class x by hexcoder

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