Math: properly test that these constructors are indeed implicit.

src/Magnum/Math/Test/ComplexTest.cpp

@@ -132,7 +132,7 @@ typedef Math::Matrix3<Float> Matrix3;
 typedef Math::Matrix2x2<Float> Matrix2x2;
 
 void ComplexTest::construct() {
-    constexpr Complex a(0.5f, -3.7f);
+    constexpr Complex a = {0.5f, -3.7f};
     CORRADE_COMPARE(a, Complex(0.5f, -3.7f));
 
     constexpr Float b = a.real();

src/Magnum/Math/Test/DualComplexTest.cpp

@@ -129,7 +129,7 @@ DualComplexTest::DualComplexTest() {
 }
 
 void DualComplexTest::construct() {
-    constexpr DualComplex a({-1.0f, 2.5f}, {3.0f, -7.5f});
+    constexpr DualComplex a = {{-1.0f, 2.5f}, {3.0f, -7.5f}};
     CORRADE_COMPARE(a, DualComplex({-1.0f, 2.5f}, {3.0f, -7.5f}));
 
     constexpr Complex b = a.real();

src/Magnum/Math/Test/DualQuaternionTest.cpp

@@ -129,7 +129,7 @@ DualQuaternionTest::DualQuaternionTest() {
 }
 
 void DualQuaternionTest::construct() {
-    constexpr DualQuaternion a({{1.0f, 2.0f, 3.0f}, -4.0f}, {{0.5f, -3.1f, 3.3f}, 2.0f});
+    constexpr DualQuaternion a = {{{1.0f, 2.0f, 3.0f}, -4.0f}, {{0.5f, -3.1f, 3.3f}, 2.0f}};
     CORRADE_COMPARE(a, DualQuaternion({{1.0f, 2.0f, 3.0f}, -4.0f}, {{0.5f, -3.1f, 3.3f}, 2.0f}));
 
     constexpr Quaternion b = a.real();

src/Magnum/Math/Test/DualTest.cpp

@@ -71,7 +71,7 @@ DualTest::DualTest() {
 }
 
 void DualTest::construct() {
-    constexpr Dual a(2.0f, -7.5f);
+    constexpr Dual a = {2.0f, -7.5f};
     constexpr Float b = a.real();
     constexpr Float c = a.dual();
     CORRADE_COMPARE(b, 2.0f);

src/Magnum/Math/Test/QuaternionTest.cpp

@@ -139,7 +139,7 @@ QuaternionTest::QuaternionTest() {
 }
 
 void QuaternionTest::construct() {
-    constexpr Quaternion a({1.0f, 2.0f, 3.0f}, -4.0f);
+    constexpr Quaternion a = {{1.0f, 2.0f, 3.0f}, -4.0f};
     CORRADE_COMPARE(a, Quaternion({1.0f, 2.0f, 3.0f}, -4.0f));
 
     constexpr Vector3 b = a.vector();

src/Magnum/Math/Test/RangeTest.cpp

@@ -165,9 +165,9 @@ RangeTest::RangeTest() {
 }
 
 void RangeTest::construct() {
-    constexpr Range1Di a(3, 23);
-    constexpr Range2Di b({3, 5}, {23, 78});
-    constexpr Range3Di c({3, 5, -7}, {23, 78, 2});
+    constexpr Range1Di a = {3, 23};
+    constexpr Range2Di b = {{3, 5}, {23, 78}};
+    constexpr Range3Di c = {{3, 5, -7}, {23, 78, 2}};
 
     CORRADE_COMPARE(a, (Range<1, Int>(3, 23)));
     CORRADE_COMPARE(b, (Range<2, Int>({3, 5}, {23, 78})));