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	* pt.c (convert_nontype_argument): Tell instantiate_type to complain.
	Do complain about overload resolution producing a non-public fn.
Fixes g++.pt/explicit75.C


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@23402 138bc75d-0d04-0410-961f-82ee72b054a4