Merge jnapiorkowski's parameterize_constructor_role branch, which

makes it easier to build a library for structured types.

diff --cc MANIFEST
index 2003dfa,2003dfa..c2075ab
--- 1/MANIFEST
--- 2/MANIFEST
+++ b/MANIFEST
@@@ -110,6 -110,6 +110,7 @@@ t/010_basics/013_create.
  t/010_basics/014_create_anon.t
  t/010_basics/015_buildargs.t
  t/010_basics/016_load_into_main.t
++t/010_basics/017_error_handling.t
  t/020_attributes/001_attribute_reader_generation.t
  t/020_attributes/002_attribute_writer_generation.t
  t/020_attributes/003_attribute_accessor_generation.t
@@@ -185,6 -185,6 +186,8 @@@ t/040_type_constraints/022_custom_type_
  t/040_type_constraints/023_types_and_undef.t
  t/040_type_constraints/024_role_type_constraint.t
  t/040_type_constraints/025_type_coersion_on_lazy_attributes.t
++t/040_type_constraints/026_normalize_type_name.t
++t/040_type_constraints/027_parameterize_from.t
  t/050_metaclasses/001_custom_attr_meta_with_roles.t
  t/050_metaclasses/002_custom_attr_meta_as_role.t
  t/050_metaclasses/003_moose_w_metaclass.t