Assertion: expression's reference | /r/CapableOf | allow cwg
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text: DR Applied to Behavior as published Correct behavior CWG 1313 C++11 undefined behavior was permitted, and all pointer subtraction was prohibited same-array pointer subtraction ok, UB prohibited CWG 1952 C++11 standard library undefined behavior was required to be diagnosed unspecified whether library UB is diagnosed CWG 2167 C++11 non-member references local to an evaluation were making the evaluation non-constexpr non-member references allowed CWG 2299 C++14 whether macros in <