message: catch throw_as exception as const reference
diff: @@ -2453,7 +2453,7 @@ constexpr T to_lvalue = x;
  DOCTEST_TOSTR(DOCTEST_HANDLE_BRACED_VA_ARGS(as))); \
  try { \
  expr; \
  - } catch(DOCTEST_HANDLE_BRACED_VA_ARGS(as)) { \
  + } catch(const DOCTEST_HANDLE_BRACED_VA_ARGS(as)&) { \
  _DOCTEST_RB.m_threw = true; \
  _DOCTEST_RB.m_threw_as = true; \
  } catch(...) { _DOCTEST_RB.unexpectedExceptionOccurred(); } \
  