Something like this help?

my @conf_enum_values = @{ Moose::Util::TypeConstraints::find_type_cons
+traint('conf')->values };
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Also, cos I'm me, here's the same thing using Type::Tiny type constraints instead:

use Types::Standard -types;

my $Conf    = Enum[qw/ access input /];
my $Version = Enum[1 .. 2];

my $FileName = StrMatch[qr/^(\w+)\.(\d+)\.txt$/, Tuple[$Conf, $Version
+]];

has filename => (is => 'rw', isa => $FileName);
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