Don't test this fragment

Once we run this code, every test file after this point fails.

Closes #3391

Author: coke

doc/Type/Metamodel/DefiniteHOW.pod6

@@ -4,6 +4,7 @@
 
 =SUBTITLE Metaobject for type definiteness
 
+=for code :skip-test<breaks the metamodel>
     class Metamodel::DefiniteHOW
         does Metamodel::Documenting
             { }