[pstl] Workaround more errors in the test suite

GitOrigin-RevId: c4823cc5db69f16bb5c96cf7d1b0d070da83605e
diff --git a/include/pstl/internal/pstl_config.h b/include/pstl/internal/pstl_config.h
index 0a5fae8..2c68d28 100644
--- a/include/pstl/internal/pstl_config.h
+++ b/include/pstl/internal/pstl_config.h
@@ -24,11 +24,7 @@
 
 // Check the user-defined macro for warnings
 #if defined(PSTL_USAGE_WARNINGS)
-#    undef _PSTL_USAGE_WARNINGS
-#    define _PSTL_USAGE_WARNINGS PSTL_USAGE_WARNINGS
-// Check the internal macro for warnings
-#elif !defined(_PSTL_USAGE_WARNINGS)
-#    define _PSTL_USAGE_WARNINGS 0
+#    define _PSTL_USAGE_WARNINGS
 #endif
 
 #if !defined(_PSTL_ASSERT)
diff --git a/test/std/algorithms/alg.modifying.operations/replace.pass.cpp b/test/std/algorithms/alg.modifying.operations/replace.pass.cpp
index 7b9bb12..9c6ca1e 100644
--- a/test/std/algorithms/alg.modifying.operations/replace.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/replace.pass.cpp
@@ -24,6 +24,7 @@
     int32_t value;
     int32_t copied_times = 0;
     constexpr explicit copy_int(int32_t val = 0) : value(val) {}
+    constexpr copy_int(copy_int const& other) : value(other.value), copied_times(other.copied_times) { }
 
     constexpr copy_int&
     operator=(const copy_int& other)
diff --git a/test/std/numerics/numeric.ops/transform_reduce.pass.cpp b/test/std/numerics/numeric.ops/transform_reduce.pass.cpp
index 9aec75a..f9c4538 100644
--- a/test/std/numerics/numeric.ops/transform_reduce.pass.cpp
+++ b/test/std/numerics/numeric.ops/transform_reduce.pass.cpp
@@ -37,7 +37,7 @@
     int32_t my_field;
     MyClass() { my_field = 0; }
     MyClass(int32_t in) { my_field = in; }
-    MyClass(const MyClass& in) { my_field = in.my_field; }
+    MyClass(const MyClass& in) = default;
 
     friend MyClass
     operator+(const MyClass& x, const MyClass& y)