Implement declarative references for enumerator

enumerator.c

@@ -188,6 +188,18 @@ struct enumerator {
     int kw_splat;
 };
 
+RUBY_REFERENCES_START(enumerator_refs)
+    REF_EDGE(enumerator, obj),
+    REF_EDGE(enumerator, args),
+    REF_EDGE(enumerator, fib),
+    REF_EDGE(enumerator, dst),
+    REF_EDGE(enumerator, lookahead),
+    REF_EDGE(enumerator, feedvalue),
+    REF_EDGE(enumerator, stop_exc),
+    REF_EDGE(enumerator, size),
+    REF_EDGE(enumerator, procs),
+RUBY_REFERENCES_END
+
 static VALUE rb_cGenerator, rb_cYielder, rb_cEnumProducer;
 
 struct generator {
@@ -237,39 +249,6 @@ struct enum_product {
 
 VALUE rb_cArithSeq;
 
-/*
- * Enumerator
- */
-static void
-enumerator_mark(void *p)
-{
-    struct enumerator *ptr = p;
-    rb_gc_mark_movable(ptr->obj);
-    rb_gc_mark_movable(ptr->args);
-    rb_gc_mark_movable(ptr->fib);
-    rb_gc_mark_movable(ptr->dst);
-    rb_gc_mark_movable(ptr->lookahead);
-    rb_gc_mark_movable(ptr->feedvalue);
-    rb_gc_mark_movable(ptr->stop_exc);
-    rb_gc_mark_movable(ptr->size);
-    rb_gc_mark_movable(ptr->procs);
-}
-
-static void
-enumerator_compact(void *p)
-{
-    struct enumerator *ptr = p;
-    ptr->obj = rb_gc_location(ptr->obj);
-    ptr->args = rb_gc_location(ptr->args);
-    ptr->fib = rb_gc_location(ptr->fib);
-    ptr->dst = rb_gc_location(ptr->dst);
-    ptr->lookahead = rb_gc_location(ptr->lookahead);
-    ptr->feedvalue = rb_gc_location(ptr->feedvalue);
-    ptr->stop_exc = rb_gc_location(ptr->stop_exc);
-    ptr->size = rb_gc_location(ptr->size);
-    ptr->procs = rb_gc_location(ptr->procs);
-}
-
 #define enumerator_free RUBY_TYPED_DEFAULT_FREE
 
 static size_t
@@ -281,12 +260,12 @@ enumerator_memsize(const void *p)
 static const rb_data_type_t enumerator_data_type = {
     "enumerator",
     {
-        enumerator_mark,
+        REFS_LIST_PTR(enumerator_refs),
         enumerator_free,
         enumerator_memsize,
-        enumerator_compact,
+        NULL,
     },
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY
+    0, NULL, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_DECL_MARKING
 };
 
 static struct enumerator *