From cb302d2475edd2d49d8e4de7ebfac050f5e89afd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E7=9A=93?= <whiteaxe@tuta.io>
Date: Tue, 18 Mar 2025 18:41:28 -0400
Subject: [PATCH] Fix implementation of `OBJ_INIT_COPY` for Ruby < 1.9

---
 binding/binding-util.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/binding/binding-util.h b/binding/binding-util.h
index 1cb6bc2f..1a543934 100644
--- a/binding/binding-util.h
+++ b/binding/binding-util.h
@@ -166,7 +166,7 @@ DEF_TYPE_CUSTOMNAME_AND_FREE(Klass, Name, freeInstance<Klass>)
 BUILTIN_TYPE(obj) == (type)))
 #endif
 
-#define OBJ_INIT_COPY(a, b) rb_obj_init_copy(a, b)
+#define OBJ_INIT_COPY(a, b) (a != b && (rb_obj_init_copy(a, b), 1))
 
 #define DEF_ALLOCFUNC_CUSTOMFREE(type, free)                                   \
 static VALUE type##Allocate(VALUE klass) {                                   \
@@ -505,7 +505,7 @@ RB_METHOD_GUARD(Typ##Load) { return objectLoad<Typ>(argc, argv, self); } RB_METH
 RB_METHOD_GUARD(Klass##InitializeCopy) {                                   \
 VALUE origObj;                                                             \
 rb_get_args(argc, argv, "o", &origObj RB_ARG_END);                         \
-if (!OBJ_INIT_COPY(self, origObj)) /* When would this fail??*/             \
+if (!OBJ_INIT_COPY(self, origObj))                                         \
 return self;                                                             \
 Klass *orig = getPrivateData<Klass>(origObj);                              \
 Klass *k = 0;                                                              \