reworked default drop implementation

core/src/drop.c

@@ -0,0 +1,6 @@
+#include "drop.h"
+#include "stdlib.h"
+
+void default_drop(void* data) {
+    free(data);
+}

core/src/drop.h

@@ -19,8 +19,13 @@ static inline Drop T##_as_Drop(T* x) {\
     return (Drop){.tc = &tc, .data = x};\
 }
 
-#define impl_default_Drop_for(T)\
+extern void default_drop(void*);
-    static void default_drop_##T(T* v) { free(v); }\
-    impl_Drop_for(T, default_drop_##T)
 
+#define impl_default_Drop_for(T)\
+static inline Drop T##_as_Drop(T* x) {\
+    static IDrop const tc = {\
+        .drop = default_drop,\
+    };\
+    return (Drop){.tc = &tc, .data = x};\
+}
 #endif // !_fencer_drop_h