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#include <iostream>
#include <stdexcept>
using namespace std;
 
class CustomException : public exception
{
	string Reason;
public:
	CustomException(const char* why) : Reason(why) {}
 
	virtual const char* what() const
	{
		return Reason.c_str();
	}
};
 
int main() {
	return 0;
}

prog.cpp:11:22: error: looser throw specifier for ‘virtual const char* CustomException::what() const’
  virtual const char* what() const
                      ^~~~
In file included from /usr/include/c++/6/ios:39:0,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/exception:71:5: error:   overriding ‘virtual const char* std::exception::what() const noexcept’
     what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
     ^~~~

Standard output is empty