[v3 PATCH] basic_string spurious use of a default constructible allocator - LWG2788

[Nina Dinka Ranns]

Tested on Linux x86_64
basic_string spurious use of a default constructible allocator - LWG2788

2019-05-27  Nina Dinka Ranns  <dinka.ranns@gmail.com>
        basic_string spurious use of a default constructible allocator - LWG2788
        * bits/basic_string.tcc:
        (_M_replace_dispatch()): string temporary now constructed with
the current allocator
        * testsuite/21_strings/basic_string/allocator/char/lwg2788.cc: New
        * testsuite/21_strings/basic_string/allocator/wchar_t/lwg2788.cc: New
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