https://git.ruby-lang.org/ruby.git/commit/?id=db2ea9b0c5

From db2ea9b0c5fb49a04af1b299a37e92f81d7cccd2 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 15 Dec 2019 00:21:19 +0900
Subject: [DOC] Fixed the class name in FrozenError#receiver


diff --git a/error.c b/error.c
index 7ef252f..9da36ae 100644
--- a/error.c
+++ b/error.c
@@ -1435,6 +1435,15 @@ frozen_err_initialize(int argc, VALUE *argv, VALUE self) https://github.com/ruby/ruby/blob/trunk/error.c#L1435
     return self;
 }
 
+/*
+ * call-seq:
+ *   frozen_error.receiver  -> object
+ *
+ * Return the receiver associated with this FrozenError exception.
+ */
+
+#define frozen_err_receiver name_err_receiver
+
 void
 rb_name_error(ID id, const char *fmt, ...)
 {
@@ -2529,7 +2538,7 @@ Init_Exception(void) https://github.com/ruby/ruby/blob/trunk/error.c#L2538
     rb_eRuntimeError = rb_define_class("RuntimeError", rb_eStandardError);
     rb_eFrozenError = rb_define_class("FrozenError", rb_eRuntimeError);
     rb_define_method(rb_eFrozenError, "initialize", frozen_err_initialize, -1);
-    rb_define_method(rb_eFrozenError, "receiver", name_err_receiver, 0);
+    rb_define_method(rb_eFrozenError, "receiver", frozen_err_receiver, 0);
     rb_eSecurityError = rb_define_class("SecurityError", rb_eException);
     rb_eNoMemError = rb_define_class("NoMemoryError", rb_eException);
     rb_eEncodingError = rb_define_class("EncodingError", rb_eStandardError);
-- 
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