test: cleanup

test/common/pointer_stable.h

@@ -7,15 +7,9 @@ namespace test {
 
 struct pointer_stable {
     static constexpr auto in_place_delete = true;
+    [[nodiscard]] constexpr bool operator==(const pointer_stable &other) const noexcept = default;
+    [[nodiscard]] constexpr auto operator<=>(const pointer_stable &other) const noexcept = default;
     int value{};
-
-    [[nodiscard]] constexpr bool operator==(const pointer_stable &other) const noexcept {
-        return value == other.value;
-    }
-
-    [[nodiscard]] constexpr auto operator<=>(const pointer_stable &other) const noexcept {
-        return value <=> other.value;
-    }
 };
 
 } // namespace test