add extra warnings for tests

untests/CMakeLists.txt

@@ -29,4 +29,11 @@ add_executable(${PROJECT_NAME} ${UNTESTS_SOURCES})
 target_link_libraries(${PROJECT_NAME}
     Catch2
     kari.hpp)
+target_compile_options(${PROJECT_NAME}
+    PRIVATE
+    $<$<CXX_COMPILER_ID:MSVC>:
+        /W4>
+    PRIVATE
+    $<$<OR:$<CXX_COMPILER_ID:GNU>,$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
+        -Wall -Wextra -Wpedantic>)
 add_test(${PROJECT_NAME} ${PROJECT_NAME})

untests/kari_tests.cpp

@@ -95,8 +95,6 @@ namespace
                 std::forward<Cs>(cs)...);
         }
     };
-
-    constexpr auto f = kari::curry(minus2_gf{}, 10, 20);
 }
 
 namespace
@@ -194,10 +192,6 @@ namespace
     static box_without_move operator+(const box_without_move& lhs, const box_without_move& rhs) {
         return box_without_move(lhs.v() + rhs.v());
     }
-
-    static box_without_move operator-(const box_without_move& lhs, const box_without_move& rhs) {
-        return box_without_move(lhs.v() - rhs.v());
-    }
 }
 
 using namespace kari;