Jonathan Wakely d364705791 libstdc++: Define std::bad_optional_access constructor as defaulted
The standard requires that std::bad_optional_access' default
constructor has a non-throwing exception specification.

	* include/std/optional (bad_optional_access): Define default
	constructor and destructor as defaulted.
	* testsuite/20_util/optional/bad_access.cc: New test.
2020-06-09 22:14:43 +01:00
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