Casey Carter c24d7974bc Expand test coverage for LWG2857
* Cover optional's emplace-from-initializer_list overload

* Verify that any::emplace and optional::emplace return a reference to the correct type even for throwing cases.

Differential Revision: https://reviews.llvm.org/D32106

llvm-svn: 301055
2017-04-21 22:38:59 +00:00
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