Math: oh, MSVC 2015 constexpr fun is here again.

src/Magnum/Math/Test/BezierTest.cpp

@@ -222,7 +222,10 @@ void BezierTest::data() {
     Vector2 c = b[2];
     CORRADE_COMPARE(c, (Vector2{0.0f, -1.2f}));
 
-    constexpr Vector2 d = *b.data();
+    #ifndef CORRADE_MSVC2015_COMPATIBILITY /* Why? */
+    constexpr
+    #endif
+    Vector2 d = *b.data();
     Vector2 e = a.data()[2];
     CORRADE_COMPARE(d, (Vector2{3.5f, 0.1f}));
     CORRADE_COMPARE(e, (Vector2{0.7f, 20.3f}));

src/Magnum/Math/Test/DualQuaternionTest.cpp

@@ -286,7 +286,10 @@ void DualQuaternionTest::data() {
 
     DualQuaternion a{{{1.0f, 2.0f, 3.0f}, -4.0f}, {{0.5f, -3.1f, 3.3f}, 2.0f}};
 
-    constexpr Float d = *ca.data();
+    #ifndef CORRADE_MSVC2015_COMPATIBILITY /* Apparently dereferencing a pointer is verboten */
+    constexpr
+    #endif
+    Float d = *ca.data();
     Float e = a.data()[7];
     CORRADE_COMPARE(d, 1.0f);
     CORRADE_COMPARE(e, 2.0f);

src/Magnum/Math/Test/QuaternionTest.cpp

@@ -284,7 +284,10 @@ void QuaternionTest::data() {
     a.scalar() = 1.1f;
     CORRADE_COMPARE(a, (Quaternion{{1.0f, 4.3f, 3.0f}, 1.1f}));
 
-    constexpr Float b = *ca.data();
+    #ifndef CORRADE_MSVC2015_COMPATIBILITY /* Apparently dereferencing a pointer is verboten */
+    constexpr
+    #endif
+    Float b = *ca.data();
     Float c = a.data()[3];
     CORRADE_COMPARE(b, 1.0f);
     CORRADE_COMPARE(c, 1.1f);

src/Magnum/Math/Test/VectorTest.cpp

@@ -309,7 +309,7 @@ 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];
-    #ifndef CORRADE_MSVC2015_COMPATIBILITY /* Apparently dereferencing pointer is verboten */
+    #ifndef CORRADE_MSVC2015_COMPATIBILITY /* Apparently dereferencing a pointer is verboten */
     constexpr
     #endif
     Float g = *a.data();