fix tests when scalar is bfloat16, half

test/array_for_matrix.cpp

diff --git a/test/array_for_matrix.cpp b/test/array_for_matrix.cpp
index 6d7d0dd..237ac67 100644
--- a/test/array_for_matrix.cpp
+++ b/test/array_for_matrix.cpp
@@ -26,7 +26,7 @@
 
   // Prevent overflows for integer types.
   if (Eigen::NumTraits<Scalar>::IsInteger) {
-    constexpr Scalar kMaxVal = Scalar(10000);
+    Scalar kMaxVal = Scalar(10000);
     m1.array() = m1.array() - kMaxVal * (m1.array() / kMaxVal);
     m2.array() = m2.array() - kMaxVal * (m2.array() / kMaxVal);
   }

test/product.h

diff --git a/test/product.h b/test/product.h
index 31f577f..74f01b0 100644
--- a/test/product.h
+++ b/test/product.h
@@ -72,7 +72,7 @@
 
   // Prevent overflows for integer types.
   if (Eigen::NumTraits<Scalar>::IsInteger) {
-    constexpr Scalar kMaxVal = Scalar(10000);
+    Scalar kMaxVal = Scalar(10000);
     m1.array() = m1.array() - kMaxVal * (m1.array() / kMaxVal);
     m2.array() = m2.array() - kMaxVal * (m2.array() / kMaxVal);
     v1.array() = v1.array() - kMaxVal * (v1.array() / kMaxVal);

test/redux.cpp

diff --git a/test/redux.cpp b/test/redux.cpp
index 872e44f..42c269a 100644
--- a/test/redux.cpp
+++ b/test/redux.cpp
@@ -24,7 +24,7 @@
 
   MatrixType m1 = MatrixType::Random(rows, cols);
 
-  // The entries of m1 are uniformly distributed in [0,1], so m1.prod() is very small. This may lead to test
+  // The entries of m1 are uniformly distributed in [-1,1), so m1.prod() is very small. This may lead to test
   // failures if we underflow into denormals. Thus, we scale so that entries are close to 1.
   MatrixType m1_for_prod = MatrixType::Ones(rows, cols) + RealScalar(0.2) * m1;
 
@@ -32,7 +32,7 @@
   m2.setRandom();
   // Prevent overflows for integer types.
   if (Eigen::NumTraits<Scalar>::IsInteger) {
-    constexpr Scalar kMaxVal = Scalar(10000);
+    Scalar kMaxVal = Scalar(10000);
     m1.array() = m1.array() - kMaxVal * (m1.array() / kMaxVal);
     m2.array() = m2.array() - kMaxVal * (m2.array() / kMaxVal);
   }

test/stl_iterators.cpp

diff --git a/test/stl_iterators.cpp b/test/stl_iterators.cpp
index 4b60e68..fee8ef5 100644
--- a/test/stl_iterators.cpp
+++ b/test/stl_iterators.cpp
@@ -466,7 +466,7 @@
     VectorType col = VectorType::Random(rows);
     // Prevent overflows for integer types.
     if (Eigen::NumTraits<Scalar>::IsInteger) {
-      constexpr Scalar kMaxVal = Scalar(1000);
+      Scalar kMaxVal = Scalar(1000);
       row.array() = row.array() - kMaxVal * (row.array() / kMaxVal);
       col.array() = col.array() - kMaxVal * (col.array() / kMaxVal);
     }