[Bug testsuite/29202] [gdb/rust] Running selftest rust-lex. Self test failed: Converting character sets: Invalid argument.

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29202

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Hmm, in ada-lang.c we have:
...
      try
        {
          convert_between_encodings
            (host_charset (), HOST_UTF32,
             (const gdb_byte *) name.data (),
             name.length (), 1,
             &storage, translit_none);
        }
      catch (const gdb_exception &)
        {
          if (throw_on_error)
            throw;

          static bool warned = false;

          /* Converting to UTF-32 shouldn't fail, so if it doesn't, we          
             might like to know why.  */
          if (!warned)
            {
            {
              warned = true;
              warning (_("could not convert '%s' from the host encoding (%s) to
UTF-32.\n"
                         "This normally should not happen, please file a bug
report."),
                       gdb::to_string (name).c_str (), host_charset ());
            }
...

I suppose we could use something similar.

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