https://git.ruby-lang.org/ruby.git/commit/?id=8119e5b0e6

From 8119e5b0e6a1341a9130c14604ade5acca6d21f3 Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Fri, 25 Sep 2020 23:45:00 +0900
Subject: memory_view.c: prevent "warning: instance variable __memory_view__
 not initialized"


diff --git a/memory_view.c b/memory_view.c
index e45cbeb..6d75b9d 100644
--- a/memory_view.c
+++ b/memory_view.c
@@ -7,6 +7,7 @@ https://github.com/ruby/ruby/blob/trunk/memory_view.c#L7
 **********************************************************************/
 
 #include "internal.h"
+#include "internal/variable.h"
 #include "internal/util.h"
 #include "ruby/memory_view.h"
 
@@ -31,7 +32,7 @@ static const rb_data_type_t memory_view_entry_data_type = { https://github.com/ruby/ruby/blob/trunk/memory_view.c#L32
 bool
 rb_memory_view_register(VALUE klass, const rb_memory_view_entry_t *entry) {
     Check_Type(klass, T_CLASS);
-    VALUE entry_obj = rb_ivar_get(klass, id_memory_view);
+    VALUE entry_obj = rb_ivar_lookup(klass, id_memory_view, Qnil);
     if (! NIL_P(entry_obj)) {
         rb_warning("Duplicated registration of memory view to %"PRIsVALUE, klass);
         return 0;
@@ -447,14 +448,14 @@ rb_memory_view_get_item_pointer(rb_memory_view_t *view, const ssize_t *indices) https://github.com/ruby/ruby/blob/trunk/memory_view.c#L448
 static const rb_memory_view_entry_t *
 lookup_memory_view_entry(VALUE klass)
 {
-    VALUE entry_obj = rb_ivar_get(klass, id_memory_view);
+    VALUE entry_obj = rb_ivar_lookup(klass, id_memory_view, Qnil);
     while (NIL_P(entry_obj)) {
         klass = rb_class_get_superclass(klass);
 
         if (klass == rb_cBasicObject || klass == rb_cObject)
             return NULL;
 
-        entry_obj = rb_ivar_get(klass, id_memory_view);
+        entry_obj = rb_ivar_lookup(klass, id_memory_view, Qnil);
     }
 
     if (! rb_typeddata_is_kind_of(entry_obj, &memory_view_entry_data_type))
-- 
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