https://git.ruby-lang.org/ruby.git/commit/?id=2a8be8ec33

From 2a8be8ec33a238410e58864f59b6ffccfd0cc19d Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 9 Jul 2019 08:31:27 +0900
Subject: Suppress uninitialized instance variable warnings


diff --git a/ext/json/generator/generator.c b/ext/json/generator/generator.c
index e59a120..036205d 100644
--- a/ext/json/generator/generator.c
+++ b/ext/json/generator/generator.c
@@ -692,7 +692,7 @@ static VALUE cState_aref(VALUE self, VALUE name) https://github.com/ruby/ruby/blob/trunk/ext/json/generator/generator.c#L692
     if (RTEST(rb_funcall(self, i_respond_to_p, 1, name))) {
         return rb_funcall(self, i_send, 1, name);
     } else {
-        return rb_ivar_get(self, rb_intern_str(rb_str_concat(rb_str_new2("@"), name)));
+        return rb_attr_get(self, rb_intern_str(rb_str_concat(rb_str_new2("@"), name)));
     }
 }
 
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