https://git.ruby-lang.org/ruby.git/commit/?id=79d280a5e8

From 79d280a5e855d623957638b6d73f530995e03cae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Tue, 27 Aug 2019 12:08:32 +0900
Subject: rb_ivar_foreach now free from ANYARGS

After 5e86b005c0f2ef30df2f9906c7e2f3abefe286a2, I now think ANYARGS is
dangerous and should be extinct.  This commit adds a function
prototype for rb_ivar_foreach.  Luckily this change revealed no
problematic usage of the function.

diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index 51d4132..3e418c3 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -957,7 +957,7 @@ void rb_free_generic_ivar(VALUE); https://github.com/ruby/ruby/blob/trunk/include/ruby/intern.h#L957
 VALUE rb_ivar_get(VALUE, ID);
 VALUE rb_ivar_set(VALUE, ID, VALUE);
 VALUE rb_ivar_defined(VALUE, ID);
-void rb_ivar_foreach(VALUE, int (*)(ANYARGS), st_data_t);
+void rb_ivar_foreach(VALUE, int (*)(ID, VALUE, st_data_t), st_data_t);
 st_index_t rb_ivar_count(VALUE);
 VALUE rb_attr_get(VALUE, ID);
 VALUE rb_obj_instance_variables(VALUE);
diff --git a/variable.c b/variable.c
index bc79dd6..4a92212 100644
--- a/variable.c
+++ b/variable.c
@@ -1391,9 +1391,11 @@ rb_ivar_defined(VALUE obj, ID id) https://github.com/ruby/ruby/blob/trunk/variable.c#L1391
     return Qfalse;
 }
 
+typedef int rb_ivar_foreach_callback_func(ID key, VALUE val, st_data_t arg);
+
 struct obj_ivar_tag {
     VALUE obj;
-    int (*func)(ID key, VALUE val, st_data_t arg);
+    rb_ivar_foreach_callback_func *func;
     st_data_t arg;
 };
 
@@ -1411,7 +1413,7 @@ obj_ivar_i(st_data_t key, st_data_t index, st_data_t arg) https://github.com/ruby/ruby/blob/trunk/variable.c#L1413
 }
 
 static void
-obj_ivar_each(VALUE obj, int (*func)(ANYARGS), st_data_t arg)
+obj_ivar_each(VALUE obj, rb_ivar_foreach_callback_func *func, st_data_t arg)
 {
     st_table *tbl;
     struct obj_ivar_tag data;
@@ -1429,7 +1431,7 @@ obj_ivar_each(VALUE obj, int (*func)(ANYARGS), st_data_t arg) https://github.com/ruby/ruby/blob/trunk/variable.c#L1431
 
 struct gen_ivar_tag {
     struct gen_ivtbl *ivtbl;
-    int (*func)(ID key, VALUE val, st_data_t arg);
+    rb_ivar_foreach_callback_func *func;
     st_data_t arg;
 };
 
@@ -1448,7 +1450,7 @@ gen_ivar_each_i(st_data_t key, st_data_t index, st_data_t data) https://github.com/ruby/ruby/blob/trunk/variable.c#L1450
 }
 
 static void
-gen_ivar_each(VALUE obj, int (*func)(ANYARGS), st_data_t arg)
+gen_ivar_each(VALUE obj, rb_ivar_foreach_callback_func *func, st_data_t arg)
 {
     struct gen_ivar_tag data;
     st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));
@@ -1531,7 +1533,7 @@ rb_copy_generic_ivar(VALUE clone, VALUE obj) https://github.com/ruby/ruby/blob/trunk/variable.c#L1533
 }
 
 void
-rb_ivar_foreach(VALUE obj, int (*func)(ANYARGS), st_data_t arg)
+rb_ivar_foreach(VALUE obj, rb_ivar_foreach_callback_func *func, st_data_t arg)
 {
     if (SPECIAL_CONST_P(obj)) return;
     switch (BUILTIN_TYPE(obj)) {
-- 
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