Added arena free macro for cleanup and clarity

include/mem.h

@@ -44,5 +44,6 @@ extern void *mem_arena_alloc(int flags, Arena *a,
     mem_arena_new((flags), (nbytes), __FILE__, __LINE__)
 #define ARENA_ALLOC(flags, a, nbytes, align, count) \
     mem_arena_alloc((flags), (a), (nbytes), (align), (count), __FILE__, __LINE__)
+#define ARENA_FREE(a) mem_free(a.beg, __FILE__, __LINE__)
 
 #endif

tests/05_arena_new.c

@@ -7,6 +7,6 @@ int main(void){
     Arena a = ARENA(0,nbytes);
     ASSERTED(a.beg != NULL);
     ASSERTED( mem_is_zero(a.beg, nbytes));
-    FREE(a.beg);
+    ARENA_FREE(a);
     return EXIT_SUCCESS;
 }

tests/06_arena_nozero.c

@@ -7,6 +7,6 @@ int main(void){
     Arena a = ARENA(NOZERO,nbytes);
     ASSERTED(a.beg != NULL);
     ASSERTED( !mem_is_zero(a.beg, nbytes));
-    FREE(a.beg);
+    ARENA_FREE(a);
     return EXIT_SUCCESS;
 }

tests/08_arena_exception.c

@@ -11,7 +11,7 @@ int main(void){
         a = ARENA(0,nbytes); /* try 1GB */
         if (!a.beg)
             RAISE(OOM);
-        free(a.beg);
+        ARENA_FREE(a);
     }
     EXCEPT(OOM) {
         /* handle memory failure gracefully */
@@ -20,7 +20,7 @@ int main(void){
     }
     FINALLY {
         /* cleanup if needed, runs always */
-        if (a.beg) free(a.beg);
+        if (a.beg) ARENA_FREE(a);
     }
     END_TRY;