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The compiler-powered is_constructible that we have in gcc 8 is powerful enough to give the right answer to an is_constructible question that would be hard for a pure-library implementation to get right in a well-formed fashion. This is just adding a test for it. Tested on Linux-PPC64, OK for trunk? 2017-12-16 Ville Voutilainen <ville.voutilainen@gmail.com> PR libstdc++/68430 * testsuite/20_util/is_constructible/68430.cc: New.
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