MSVC 2015 compatibility: apparently dereferencing pointer is verboten.

src/Magnum/Math/Test/BoolVectorTest.cpp

@@ -143,7 +143,10 @@ void BoolVectorTest::data() {
     constexpr bool b = a[9];
     CORRADE_COMPARE(b, true);
 
-    constexpr UnsignedByte c = *a.data();
+    #ifndef CORRADE_MSVC2015_COMPATIBILITY /* Apparently dereferencing pointer is verboten */
+    constexpr
+    #endif
+    UnsignedByte c = *a.data();
     CORRADE_COMPARE(c, 0x08);
 
     BoolVector19 d(0x08, 0x03, 0x04);

src/Magnum/Math/Test/RectangularMatrixTest.cpp

@@ -283,7 +283,10 @@ void RectangularMatrixTest::data() {
     #endif
     Vector4 b = a[2];
     constexpr Float c = a[1][2];
-    constexpr Float d = *a.data();
+    #ifndef CORRADE_MSVC2015_COMPATIBILITY /* Apparently dereferencing pointer is verboten */
+    constexpr
+    #endif
+    Float d = *a.data();
     CORRADE_COMPARE(b, Vector4(7.0f, -1.7f, 8.0f, 0.0f));
     CORRADE_COMPARE(c, 7.0f);
     CORRADE_COMPARE(d, 3.0f);

src/Magnum/Math/Test/VectorTest.cpp

@@ -291,7 +291,10 @@ void VectorTest::data() {
     /* Pointer chasings, i.e. *(b.data()[3]), are not possible */
     constexpr Vector4 a(1.0f, 2.0f, -3.0f, 4.5f);
     constexpr Float f = a[3];
-    constexpr Float g = *a.data();
+    #ifndef CORRADE_MSVC2015_COMPATIBILITY /* Apparently dereferencing pointer is verboten */
+    constexpr
+    #endif
+    Float g = *a.data();
     CORRADE_COMPARE(f, 4.5f);
     CORRADE_COMPARE(g, 1.0f);
 }