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Tested on Linux-x64. 2017-03-12 Ville Voutilainen <ville.voutilainen@gmail.com> Implement LWG 2806, Base class of bad_optional_access. * include/std/optional (bad_optional_access): Derive from std::exception. (bad_optional_access::bad_optional_access): Adjust. (bad_optional_access::what): New. (__throw_bad_optional_access(const char*)): Remove the parameter and adjust calls. * testsuite/20_util/optional/cons/value_neg.cc: Adjust. * testsuite/20_util/optional/typedefs.cc: Likewise.
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