[nci]:  Update the "Illegal type" message of UnManagedStruct to at least tell us what type was illegal.
[nci]:  Update the "Illegal type" message of UnManagedStruct to at least tell us what type was illegal.

tkob/parrot,parrot/parrot,gagern/parrot,gitster/parrot,FROGGS/parrot,parrot/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,FROGGS/parrot,youprofit/parrot,gagern/parrot,youprofit/parrot,gagern/parrot,youprofit/parrot,youprofit/parrot,tkob/parrot,gitster/parrot,FROGGS/parrot,gagern/parrot,parrot/parrot,parrot/parrot,youprofit/parrot,FROGGS/parrot,parrot/parrot,youprofit/parrot,gagern/parrot,FROGGS/parrot,gitster/parrot,FROGGS/parrot,tkob/parrot,gitster/parrot,tkob/parrot,FROGGS/parrot,FROGGS/parrot,gitster/parrot,youprofit/parrot,gitster/parrot,gagern/parrot,gagern/parrot,tkob/parrot,gitster/parrot,tkob/parrot