[Bug libstdc++/86658] [9 Regression] Debug mode: std::copy(..., std::inserter(...)) causes "Error: attempt to copy-construct an iterator from a singular iterator."

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86658

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Jul 24 20:49:10 2018
New Revision: 262952

URL: https://gcc.gnu.org/viewcvs?rev=262952&root=gcc&view=rev
Log:
PR libstdc++/86658 fix __niter_wrap to not copy invalid iterators

An output iterator passed as the unused first argument to __niter_wrap
might have already been invalidated, so don't copy it.

        PR libstdc++/86658
        * include/bits/stl_algobase.h (__niter_wrap<_Iterator>): Pass unused
        parameter by reference, to avoid copying invalid iterators.
        * testsuite/25_algorithms/copy/86658.cc: New test.

Added:
    trunk/libstdc++-v3/testsuite/25_algorithms/copy/86658.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/stl_algobase.h