[Bug libstdc++/86419] New: codecvt::in() and out() incorrectly return partial in some cases.

[dmjpp at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86419

            Bug ID: 86419
           Summary: codecvt<char16_t, ...>::in() and out() incorrectly
                    return partial in some cases.
           Product: gcc
           Version: 7.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dmjpp at hotmail dot com
  Target Milestone: ---

I have created a bunch of test cases, and on some it fails unexpectedly. I'll
post the code as attachment, the lines with the bug have the word "bug".