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diff --git a/lib/Mouse/Meta/TypeConstraint.pm b/lib/Mouse/Meta/TypeConstraint.pm
index 5687626..3d2f195 100644 (file)
--- a/lib/Mouse/Meta/TypeConstraint.pm
+++ b/lib/Mouse/Meta/TypeConstraint.pm
@@ -249,11 +249,12 @@ sub parameterize{
         || Carp::confess("The $name constraint cannot be used, because $param doesn't subtype from a parameterizable type");
 
     return Mouse::Meta::TypeConstraint->new(
-        name               => $name,
-        parent             => $self,
-        constraint         => $generator->($param),
+        name        => $name,
+        parent      => $self,
+        parameter   => $param,
+        constraint  => $generator->($param), # must be 'constraint', not 'optimized'
 
-        type               => 'Parameterized',
+        type        => 'Parameterized',
     );
 }