You want this: 

use Moose::Util::TypeConstraints qw[ find_type_constraint ];

# ...

find_type_constraint('MyType')->check( $my_value );

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Basically all this does it locate the underlying type constraint object for you. Alternately you could find the type constraint object in the actual class, which is explain in Moose::Cookbook::Snack::Types.

-stvn

In reply to Re: Validating against a Moose type-constraint without setting field by stvn
in thread Validating against a Moose type-constraint without setting field by locked_user sundialsvc4

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