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I added a static assertion to enforce the CopyConstructible requirement that the standard imposes for std::throw_with_nested. Unfortunately the standard is defective, so we started rejecting perfectly good code. This alters the check to what I think the standard should say (and what I've proposed in a new issue against the standard): we should check decay<T> not remove_reference<T>, because a throw-expression decays arrays and functions to pointers. PR libstdc++/79114 * libsupc++/nested_exception.h (throw_with_nested): Use decay instead of remove_reference. * testsuite/18_support/nested_exception/79114.cc: New test. Tested powerpc64le-linux, committed to trunk.
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