https://git.ruby-lang.org/ruby.git/commit/?id=42ac3f79ba

From 42ac3f79ba7104b234546f906f51de485d3a1823 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 25 Apr 2020 09:29:27 +0900
Subject: Assert that typed data is distinguished from non-typed


diff --git a/gc.c b/gc.c
index 67c3556..56e907a 100644
--- a/gc.c
+++ b/gc.c
@@ -2327,6 +2327,7 @@ rb_imemo_new_debug(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0, https://github.com/ruby/ruby/blob/trunk/gc.c#L2327
 VALUE
 rb_data_object_wrap(VALUE klass, void *datap, RUBY_DATA_FUNC dmark, RUBY_DATA_FUNC dfree)
 {
+    RUBY_ASSERT_ALWAYS(dfree != (RUBY_DATA_FUNC)1);
     if (klass) Check_Type(klass, T_CLASS);
     return newobj_of(klass, T_DATA, (VALUE)dmark, (VALUE)dfree, (VALUE)datap, FALSE);
 }
@@ -2342,6 +2343,7 @@ rb_data_object_zalloc(VALUE klass, size_t size, RUBY_DATA_FUNC dmark, RUBY_DATA_ https://github.com/ruby/ruby/blob/trunk/gc.c#L2343
 VALUE
 rb_data_typed_object_wrap(VALUE klass, void *datap, const rb_data_type_t *type)
 {
+    RUBY_ASSERT_ALWAYS(type);
     if (klass) Check_Type(klass, T_CLASS);
     return newobj_of(klass, T_DATA, (VALUE)type, (VALUE)1, (VALUE)datap, type->flags & RUBY_FL_WB_PROTECTED);
 }
-- 
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