[Bug libstdc++/71364] New: [7 regression] recent tuple changes break range-v3 merge.cpp

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71364

            Bug ID: 71364
           Summary: [7 regression] recent tuple changes break range-v3
                    merge.cpp
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jason at gcc dot gnu.org
                CC: ville.voutilainen at gmail dot com
  Target Milestone: ---

Created attachment 38614
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38614&action=edit
unincluded testcase

I periodically check that G++ still builds Eric Niebler's range-v3 properly;
recently the merge.cpp test started failing.  This seems to be due to Ville's
recent tuple change.