diff --git a/libs/algorithm/test/adjacent_find.cpp b/libs/algorithm/test/adjacent_find.cpp
index 4c56b7b0..59084f9d 100644
--- a/libs/algorithm/test/adjacent_find.cpp
+++ b/libs/algorithm/test/adjacent_find.cpp
@@ -83,7 +83,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::adjacent_find(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -115,7 +114,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/all_of.cpp b/libs/algorithm/test/all_of.cpp
index 8ec4c5e5..75ba24d8 100644
--- a/libs/algorithm/test/all_of.cpp
+++ b/libs/algorithm/test/all_of.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::all_of(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/all_of_equal.cpp b/libs/algorithm/test/all_of_equal.cpp
index 5ce1a986..70ac231b 100644
--- a/libs/algorithm/test/all_of_equal.cpp
+++ b/libs/algorithm/test/all_of_equal.cpp
@@ -53,7 +53,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::all_of_equal(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -70,7 +69,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/any_of.cpp b/libs/algorithm/test/any_of.cpp
index 2ef79a17..b3e117ef 100644
--- a/libs/algorithm/test/any_of.cpp
+++ b/libs/algorithm/test/any_of.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(!result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::any_of(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/any_of_equal.cpp b/libs/algorithm/test/any_of_equal.cpp
index cf57de9d..6ed4fef4 100644
--- a/libs/algorithm/test/any_of_equal.cpp
+++ b/libs/algorithm/test/any_of_equal.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(!result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::any_of_equal(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/binary_search.cpp b/libs/algorithm/test/binary_search.cpp
index 2e233019..2bb81e60 100644
--- a/libs/algorithm/test/binary_search.cpp
+++ b/libs/algorithm/test/binary_search.cpp
@@ -37,7 +37,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(!result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::binary_search(
 					testspr::reduct_forward(sprout::begin(arr1)),
@@ -55,9 +54,7 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::binary_search(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -75,7 +72,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/count.cpp b/libs/algorithm/test/count.cpp
index 00aecfcc..db175535 100644
--- a/libs/algorithm/test/count.cpp
+++ b/libs/algorithm/test/count.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result == 0);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::count(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result == 0);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/count_if.cpp b/libs/algorithm/test/count_if.cpp
index 2272d3b2..7e19a24d 100644
--- a/libs/algorithm/test/count_if.cpp
+++ b/libs/algorithm/test/count_if.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result == 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::count_if(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result == 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/equal.cpp b/libs/algorithm/test/equal.cpp
index 961a4026..f479336b 100644
--- a/libs/algorithm/test/equal.cpp
+++ b/libs/algorithm/test/equal.cpp
@@ -161,7 +161,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::equal(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -231,7 +230,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::equal(
@@ -388,7 +386,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::equal(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -466,7 +463,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/equal_range.cpp b/libs/algorithm/test/equal_range.cpp
index b1fe1c0b..cd9be6b0 100644
--- a/libs/algorithm/test/equal_range.cpp
+++ b/libs/algorithm/test/equal_range.cpp
@@ -64,7 +64,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(sprout::distance(found.first.base(), found.second.base()) == 0);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::equal_range(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -86,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found.second.base() == sprout::begin(arr1) + 5);
 				TESTSPR_BOTH_ASSERT(sprout::distance(found.first.base(), found.second.base()) == 0);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/find.cpp b/libs/algorithm/test/find.cpp
index 6d31ce9f..c3007a33 100644
--- a/libs/algorithm/test/find.cpp
+++ b/libs/algorithm/test/find.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::find(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/find_end.cpp b/libs/algorithm/test/find_end.cpp
index 68dddc7a..119057b2 100644
--- a/libs/algorithm/test/find_end.cpp
+++ b/libs/algorithm/test/find_end.cpp
@@ -177,7 +177,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::find_end(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -218,7 +217,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/find_first_of.cpp b/libs/algorithm/test/find_first_of.cpp
index e672a041..4753147c 100644
--- a/libs/algorithm/test/find_first_of.cpp
+++ b/libs/algorithm/test/find_first_of.cpp
@@ -177,7 +177,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::find_first_of(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -255,7 +254,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/find_if.cpp b/libs/algorithm/test/find_if.cpp
index 0b26da28..1adebd49 100644
--- a/libs/algorithm/test/find_if.cpp
+++ b/libs/algorithm/test/find_if.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::find_if(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/find_if_not.cpp b/libs/algorithm/test/find_if_not.cpp
index 4beacc28..0fcfa836 100644
--- a/libs/algorithm/test/find_if_not.cpp
+++ b/libs/algorithm/test/find_if_not.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::find_if_not(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/includes.cpp b/libs/algorithm/test/includes.cpp
index 64df349d..ff886f83 100644
--- a/libs/algorithm/test/includes.cpp
+++ b/libs/algorithm/test/includes.cpp
@@ -99,7 +99,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(!result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::includes(
 					testspr::reduct_input(sprout::begin(arr1)),
@@ -177,9 +176,7 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::includes(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -257,7 +254,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_decreasing.cpp b/libs/algorithm/test/is_decreasing.cpp
index 4ea6c9df..5e1cb284 100644
--- a/libs/algorithm/test/is_decreasing.cpp
+++ b/libs/algorithm/test/is_decreasing.cpp
@@ -34,7 +34,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_decreasing(
 					testspr::reduct_forward(sprout::begin(arr1)),
@@ -49,9 +48,7 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_decreasing(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -66,7 +63,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_heap.cpp b/libs/algorithm/test/is_heap.cpp
index d66fb3f3..b9686e86 100644
--- a/libs/algorithm/test/is_heap.cpp
+++ b/libs/algorithm/test/is_heap.cpp
@@ -81,7 +81,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_heap(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -142,7 +141,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_heap_until.cpp b/libs/algorithm/test/is_heap_until.cpp
index 8e4696ac..d51c9917 100644
--- a/libs/algorithm/test/is_heap_until.cpp
+++ b/libs/algorithm/test/is_heap_until.cpp
@@ -81,7 +81,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr2) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::is_heap_until(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -142,7 +141,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr2) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_increasing.cpp b/libs/algorithm/test/is_increasing.cpp
index 5955a256..da897907 100644
--- a/libs/algorithm/test/is_increasing.cpp
+++ b/libs/algorithm/test/is_increasing.cpp
@@ -34,7 +34,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_increasing(
 					testspr::reduct_forward(sprout::begin(arr1)),
@@ -49,9 +48,7 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_increasing(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -66,7 +63,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_partitioned.cpp b/libs/algorithm/test/is_partitioned.cpp
index 5b54410b..04967295 100644
--- a/libs/algorithm/test/is_partitioned.cpp
+++ b/libs/algorithm/test/is_partitioned.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_partitioned(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_permutation.cpp b/libs/algorithm/test/is_permutation.cpp
index cb707c93..b32ffe20 100644
--- a/libs/algorithm/test/is_permutation.cpp
+++ b/libs/algorithm/test/is_permutation.cpp
@@ -161,7 +161,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_permutation(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -231,7 +230,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_permutation(
@@ -389,7 +387,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_permutation(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -467,7 +464,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_sorted.cpp b/libs/algorithm/test/is_sorted.cpp
index cdaa5aa7..15166f9f 100644
--- a/libs/algorithm/test/is_sorted.cpp
+++ b/libs/algorithm/test/is_sorted.cpp
@@ -50,7 +50,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_sorted(
 					testspr::reduct_forward(sprout::begin(arr1)),
@@ -81,9 +80,7 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_sorted(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -114,7 +111,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_sorted_until.cpp b/libs/algorithm/test/is_sorted_until.cpp
index 43c62187..e66b7e20 100644
--- a/libs/algorithm/test/is_sorted_until.cpp
+++ b/libs/algorithm/test/is_sorted_until.cpp
@@ -81,7 +81,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::is_sorted_until(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -112,7 +111,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_strictly_decreasing.cpp b/libs/algorithm/test/is_strictly_decreasing.cpp
index d6601dcb..f3d9587d 100644
--- a/libs/algorithm/test/is_strictly_decreasing.cpp
+++ b/libs/algorithm/test/is_strictly_decreasing.cpp
@@ -49,7 +49,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(!result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_strictly_decreasing(
 					testspr::reduct_forward(sprout::begin(arr1)),
@@ -78,9 +77,7 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_strictly_decreasing(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -109,7 +106,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/is_strictly_increasing.cpp b/libs/algorithm/test/is_strictly_increasing.cpp
index 0b3922f3..93f07d37 100644
--- a/libs/algorithm/test/is_strictly_increasing.cpp
+++ b/libs/algorithm/test/is_strictly_increasing.cpp
@@ -49,7 +49,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(!result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_strictly_increasing(
 					testspr::reduct_forward(sprout::begin(arr1)),
@@ -78,9 +77,7 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::is_strictly_increasing(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -109,7 +106,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/lexicographical_compare.cpp b/libs/algorithm/test/lexicographical_compare.cpp
index 5684bc93..86e820fc 100644
--- a/libs/algorithm/test/lexicographical_compare.cpp
+++ b/libs/algorithm/test/lexicographical_compare.cpp
@@ -156,7 +156,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(!result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
 					testspr::reduct_input(sprout::begin(arr1)),
@@ -290,9 +289,7 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::lexicographical_compare(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -426,7 +423,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/lower_bound.cpp b/libs/algorithm/test/lower_bound.cpp
index 6ed91867..829206e5 100644
--- a/libs/algorithm/test/lower_bound.cpp
+++ b/libs/algorithm/test/lower_bound.cpp
@@ -55,7 +55,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::lower_bound(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -73,7 +72,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/max_element.cpp b/libs/algorithm/test/max_element.cpp
index c20af774..649dd03f 100644
--- a/libs/algorithm/test/max_element.cpp
+++ b/libs/algorithm/test/max_element.cpp
@@ -81,7 +81,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result == sprout::begin(arr1) + 4);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::max_element(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -112,7 +111,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(result == sprout::begin(arr1) + 4);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/min_element.cpp b/libs/algorithm/test/min_element.cpp
index e4d09206..48f5fc59 100644
--- a/libs/algorithm/test/min_element.cpp
+++ b/libs/algorithm/test/min_element.cpp
@@ -81,7 +81,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result == sprout::begin(arr1) + 3);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::min_element(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -112,7 +111,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(result == sprout::begin(arr1) + 3);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/minmax_element.cpp b/libs/algorithm/test/minmax_element.cpp
index 4c677362..cbcf0104 100644
--- a/libs/algorithm/test/minmax_element.cpp
+++ b/libs/algorithm/test/minmax_element.cpp
@@ -89,7 +89,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result.second.base() == sprout::begin(arr1) + 4);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::minmax_element(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -124,7 +123,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result.first.base() == sprout::begin(arr1) + 3);
 				TESTSPR_BOTH_ASSERT(result.second.base() == sprout::begin(arr1) + 4);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/mismatch.cpp b/libs/algorithm/test/mismatch.cpp
index cf6de4bf..b0706369 100644
--- a/libs/algorithm/test/mismatch.cpp
+++ b/libs/algorithm/test/mismatch.cpp
@@ -177,7 +177,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found.second.base() == sprout::begin(arr2));
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::mismatch(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -255,7 +254,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found.first.base() == sprout::begin(arr1));
 				TESTSPR_BOTH_ASSERT(found.second.base() == sprout::begin(arr2));
 			}
-#endif
 
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::mismatch(
@@ -429,7 +427,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found.second.base() == sprout::begin(arr2));
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::mismatch(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -515,7 +512,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found.first.base() == sprout::begin(arr1));
 				TESTSPR_BOTH_ASSERT(found.second.base() == sprout::begin(arr2));
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/none_of.cpp b/libs/algorithm/test/none_of.cpp
index 4a8ebb6e..f3b1d25a 100644
--- a/libs/algorithm/test/none_of.cpp
+++ b/libs/algorithm/test/none_of.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::none_of(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/none_of_equal.cpp b/libs/algorithm/test/none_of_equal.cpp
index 0fe427e4..b24bd7d0 100644
--- a/libs/algorithm/test/none_of_equal.cpp
+++ b/libs/algorithm/test/none_of_equal.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::none_of_equal(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/one_of.cpp b/libs/algorithm/test/one_of.cpp
index dc1272c2..8c6c3165 100644
--- a/libs/algorithm/test/one_of.cpp
+++ b/libs/algorithm/test/one_of.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(!result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::one_of(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/one_of_equal.cpp b/libs/algorithm/test/one_of_equal.cpp
index ae5781ac..becb8348 100644
--- a/libs/algorithm/test/one_of_equal.cpp
+++ b/libs/algorithm/test/one_of_equal.cpp
@@ -85,7 +85,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(!result);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::one_of_equal(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -118,7 +117,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(!result);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/partition_point.cpp b/libs/algorithm/test/partition_point.cpp
index 0eaf60d9..6af109bf 100644
--- a/libs/algorithm/test/partition_point.cpp
+++ b/libs/algorithm/test/partition_point.cpp
@@ -53,7 +53,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::partition_point(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -70,7 +69,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/search.cpp b/libs/algorithm/test/search.cpp
index 4ce13c99..5e9c3077 100644
--- a/libs/algorithm/test/search.cpp
+++ b/libs/algorithm/test/search.cpp
@@ -177,7 +177,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::search(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -255,7 +254,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/search_n.cpp b/libs/algorithm/test/search_n.cpp
index e201aee1..7b6a6183 100644
--- a/libs/algorithm/test/search_n.cpp
+++ b/libs/algorithm/test/search_n.cpp
@@ -175,7 +175,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::search_n(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -253,7 +252,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/tristate_lexicographical_compare.cpp b/libs/algorithm/test/tristate_lexicographical_compare.cpp
index 094b6a73..a2640f96 100644
--- a/libs/algorithm/test/tristate_lexicographical_compare.cpp
+++ b/libs/algorithm/test/tristate_lexicographical_compare.cpp
@@ -156,7 +156,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(result > 0);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::tristate_lexicographical_compare(
 					testspr::reduct_input(sprout::begin(arr1)),
@@ -290,9 +289,7 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result > 0);
 			}
-#endif
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto result = sprout::tristate_lexicographical_compare(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -426,7 +423,6 @@ namespace testspr {
 					);
 				TESTSPR_BOTH_ASSERT(result > 0);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/libs/algorithm/test/upper_bound.cpp b/libs/algorithm/test/upper_bound.cpp
index c18f8098..750e1b58 100644
--- a/libs/algorithm/test/upper_bound.cpp
+++ b/libs/algorithm/test/upper_bound.cpp
@@ -55,7 +55,6 @@ namespace testspr {
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
 
-#if defined(__clang__)
 			{
 				SPROUT_STATIC_CONSTEXPR auto found = sprout::upper_bound(
 					testspr::reduct_random_access(sprout::begin(arr1)),
@@ -73,7 +72,6 @@ namespace testspr {
 					).base();
 				TESTSPR_BOTH_ASSERT(found == sprout::begin(arr1) + 5);
 			}
-#endif
 		}
 	}
 }	// namespace testspr
diff --git a/sprout/algorithm/find_end.hpp b/sprout/algorithm/find_end.hpp
index 0ee55e4a..00519edb 100644
--- a/sprout/algorithm/find_end.hpp
+++ b/sprout/algorithm/find_end.hpp
@@ -19,70 +19,71 @@
 
 namespace sprout {
 	namespace detail {
-		template<typename RandomAccessIterator1>
-		inline SPROUT_CONSTEXPR RandomAccessIterator1
-		find_end_impl_check_ra(RandomAccessIterator1 first1, RandomAccessIterator1 result, RandomAccessIterator1 searched) {
-			return searched == first1 ? searched
-				: result
-				;
-		}
-		template<typename RandomAccessIterator1, typename ForwardIterator2, typename BinaryPredicate>
-		inline SPROUT_CONSTEXPR RandomAccessIterator1
-		find_end_impl_ra(
-			RandomAccessIterator1 first1, RandomAccessIterator1 last1,
-			ForwardIterator2 first2, ForwardIterator2 last2,
-			BinaryPredicate pred,
-			typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot, RandomAccessIterator1 last1_, RandomAccessIterator1 result,
-			RandomAccessIterator1 searched
-			)
-		{
-			return searched == last1_ ? result
-				: searched < first1 ? pivot == 0
-					? sprout::detail::find_end_impl_check_ra(
-						first1, searched,
-						sprout::detail::search_one(first1, last1_, first2, last2, pred)
-						)
-					: sprout::detail::find_end_impl_ra(
-						sprout::next(first1, pivot), last1, first2, last2, pred,
-						(sprout::distance(first1, last1) - pivot) / 2, last1_, searched,
-						sprout::detail::find_end_impl_ra(
-							first1, sprout::next(first1, pivot), first2, last2, pred,
-							pivot / 2, last1_, searched,
-							first1
-							)
-						)
-				: pivot == 0 ? sprout::detail::search_one(first1, last1_, first2, last2, pred)
-				: sprout::detail::find_end_impl_ra(
-					sprout::next(first1, pivot), last1, first2, last2, pred,
-					(sprout::distance(first1, last1) - pivot) / 2, last1_, result,
-					sprout::detail::find_end_impl_ra(
-						first1, sprout::next(first1, pivot), first2, last2, pred,
-						pivot / 2, last1_, result,
-						first1
-						)
-					)
-				;
-		}
-		template<typename RandomAccessIterator1, typename ForwardIterator2, typename BinaryPredicate>
-		inline SPROUT_CONSTEXPR typename std::enable_if<
-			sprout::is_constant_distance_iterator<RandomAccessIterator1>::value,
-			RandomAccessIterator1
-		>::type
-		find_end(
-			RandomAccessIterator1 first1, RandomAccessIterator1 last1,
-			ForwardIterator2 first2, ForwardIterator2 last2,
-			BinaryPredicate pred,
-			std::random_access_iterator_tag*
-			)
-		{
-			return first1 == last1 ? last1
-				: sprout::detail::find_end_impl_ra(
-					first1, last1, first2, last2, pred,
-					sprout::distance(first1, last1) / 2, last1, last1,
-					first1
-					)
-				;
-		}
+		// !!!
+//		template<typename RandomAccessIterator1>
+//		inline SPROUT_CONSTEXPR RandomAccessIterator1
+//		find_end_impl_check_ra(RandomAccessIterator1 first1, RandomAccessIterator1 result, RandomAccessIterator1 searched) {
+//			return searched == first1 ? searched
+//				: result
+//				;
+//		}
+//		template<typename RandomAccessIterator1, typename ForwardIterator2, typename BinaryPredicate>
+//		inline SPROUT_CONSTEXPR RandomAccessIterator1
+//		find_end_impl_ra(
+//			RandomAccessIterator1 first1, RandomAccessIterator1 last1,
+//			ForwardIterator2 first2, ForwardIterator2 last2,
+//			BinaryPredicate pred,
+//			typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot, RandomAccessIterator1 last1_, RandomAccessIterator1 result,
+//			RandomAccessIterator1 searched
+//			)
+//		{
+//			return searched == last1_ ? result
+//				: searched < first1 ? pivot == 0
+//					? sprout::detail::find_end_impl_check_ra(
+//						first1, searched,
+//						sprout::detail::search_one(first1, last1_, first2, last2, pred)
+//						)
+//					: sprout::detail::find_end_impl_ra(
+//						sprout::next(first1, pivot), last1, first2, last2, pred,
+//						(sprout::distance(first1, last1) - pivot) / 2, last1_, searched,
+//						sprout::detail::find_end_impl_ra(
+//							first1, sprout::next(first1, pivot), first2, last2, pred,
+//							pivot / 2, last1_, searched,
+//							first1
+//							)
+//						)
+//				: pivot == 0 ? sprout::detail::search_one(first1, last1_, first2, last2, pred)
+//				: sprout::detail::find_end_impl_ra(
+//					sprout::next(first1, pivot), last1, first2, last2, pred,
+//					(sprout::distance(first1, last1) - pivot) / 2, last1_, result,
+//					sprout::detail::find_end_impl_ra(
+//						first1, sprout::next(first1, pivot), first2, last2, pred,
+//						pivot / 2, last1_, result,
+//						first1
+//						)
+//					)
+//				;
+//		}
+//		template<typename RandomAccessIterator1, typename ForwardIterator2, typename BinaryPredicate>
+//		inline SPROUT_CONSTEXPR typename std::enable_if<
+//			sprout::is_constant_distance_iterator<RandomAccessIterator1>::value,
+//			RandomAccessIterator1
+//		>::type
+//		find_end(
+//			RandomAccessIterator1 first1, RandomAccessIterator1 last1,
+//			ForwardIterator2 first2, ForwardIterator2 last2,
+//			BinaryPredicate pred,
+//			std::random_access_iterator_tag*
+//			)
+//		{
+//			return first1 == last1 ? last1
+//				: sprout::detail::find_end_impl_ra(
+//					first1, last1, first2, last2, pred,
+//					sprout::distance(first1, last1) / 2, last1, last1,
+//					first1
+//					)
+//				;
+//		}
 
 		template<typename ForwardIterator1>
 		inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator1, ForwardIterator1>
diff --git a/sprout/algorithm/fixed/next_permutation.hpp b/sprout/algorithm/fixed/next_permutation.hpp
index 7579148d..cd2ac0ac 100644
--- a/sprout/algorithm/fixed/next_permutation.hpp
+++ b/sprout/algorithm/fixed/next_permutation.hpp
@@ -14,6 +14,7 @@
 #include <sprout/iterator/operation.hpp>
 #include <sprout/algorithm/fixed/result_of.hpp>
 #include <sprout/algorithm/fixed/swap_element.hpp>
+#include <sprout/algorithm/fixed/reverse_copy.hpp>
 #include <sprout/algorithm/fixed/reverse.hpp>
 #include <sprout/sub_array/sub_array.hpp>
 #include <sprout/utility/pair/pair.hpp>
diff --git a/sprout/algorithm/fixed/prev_permutation.hpp b/sprout/algorithm/fixed/prev_permutation.hpp
index 6a53e8b7..3d357c6f 100644
--- a/sprout/algorithm/fixed/prev_permutation.hpp
+++ b/sprout/algorithm/fixed/prev_permutation.hpp
@@ -14,6 +14,7 @@
 #include <sprout/iterator/operation.hpp>
 #include <sprout/algorithm/fixed/result_of.hpp>
 #include <sprout/algorithm/fixed/swap_element.hpp>
+#include <sprout/algorithm/fixed/reverse_copy.hpp>
 #include <sprout/algorithm/fixed/reverse.hpp>
 #include <sprout/sub_array/sub_array.hpp>
 #include <sprout/utility/pair/pair.hpp>
diff --git a/sprout/workaround/recursive_function_template.hpp b/sprout/workaround/recursive_function_template.hpp
index 72f98b04..b7a50034 100644
--- a/sprout/workaround/recursive_function_template.hpp
+++ b/sprout/workaround/recursive_function_template.hpp
@@ -20,7 +20,7 @@
 //
 #ifndef SPROUT_RECURSIVE_FUNCTION_TEMPLATE_INSTANTIATION_LIMIT
 #	if defined(__clang__)
-#		if (__clang_major__ < 3 || (__clang_major__ == 3 && __clang_major__ <= 2))
+#		if (__clang_major__ < 3 || (__clang_major__ == 3 && __clang_minor__ <= 2))
 #			define SPROUT_RECURSIVE_FUNCTION_TEMPLATE_INSTANTIATION_LIMIT 512
 #		else
 #			define SPROUT_RECURSIVE_FUNCTION_TEMPLATE_INSTANTIATION_LIMIT 256