https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86419
--- Comment #8 from Dimitrij Mijoski <dmjpp at hotmail dot com> --- Looking again at my proposed fix in comment #6, i concluded it is not the best fix. It will fix the testsuite in the same comment #6, but I discovered another class of errors related to the lines I am touching in that proposed fix. The error is when we have an incomplete sequence which is in the middle of the from range, and not at the end. In such cases codecvt_base::error should be returned. The bug exists in UTF8->UTF16, UTF8->UCS4 and UTF16->UCS4. I guess some more test need to be written about returning error.
