Review partial fixes

include/graphblas/reference/compressed_storage.hpp

@@ -47,11 +47,11 @@ namespace grb {
 			 * Performs no safety checking. Performs no (re-)allocations.
 			 *
 			 * @param[out] output The container to copy the coordinates to.
-			 * @param[in] input   The container to copy the coordinates from.
-			 * @param[in] nz      The number of nonzeroes in the \a other container.
-			 * @param[in] m       The index dimension of the \a other container.
-			 * @param[in] k       The start position to copy from (inclusive).
-			 * @param[in] end     The end position to copy to (exclusive).
+			 * @param[in]  input  The container to copy the coordinates from.
+			 * @param[in]  nz     The number of nonzeroes in the \a other container.
+			 * @param[in]  m      The index dimension of the \a other container.
+			 * @param[in]  k      The start position to copy from (inclusive).
+			 * @param[in]  end    The end position to copy to (exclusive).
 			 *
 			 * The copy range is 2nz + m + 1, i.e.,
 			 *   -# 0 <= start <  2nz + m + 1

include/graphblas/reference/io.hpp

@@ -642,8 +642,10 @@ namespace grb {
 	 *
 	 * \todo Check and, if needed, revise performance semantics.
 	 */
-	template< Descriptor descr = descriptors::no_operation,
-		typename OutputType, typename InputType, typename Coords >
+	template<
+		Descriptor descr = descriptors::no_operation,
+		typename OutputType, typename InputType, typename Coords
+	>
 	RC set(
 		Vector< OutputType, reference, Coords > &x,
 		const Vector< InputType, reference, Coords > &y,
@@ -989,11 +991,15 @@ namespace grb {
 				"if A is a mask, then C must not be a void matrix"
 			);
 			static_assert(
-				A_is_mask ||
-				( !A_is_mask &&
-				  std::is_convertible< ValueType, OutputType >::value ),
+				A_is_mask || std::is_convertible< ValueType, OutputType >::value,
 				"internal::grb::set called with non-matching value types"
 			);
+			static_assert(
+				! A_is_mask ||
+				! ( descr & descriptors::structural && descr & descriptors::invert_mask ),
+				"internal::grb::set can not be called with both descriptors::structural "
+				"and descriptors::invert_mask in the masked variant"
+			);
 			NO_CAST_ASSERT(
 				( !( descr & descriptors::no_casting ) ||
 				( !A_is_mask && std::is_same< InputType, OutputType >::value ) ),