https://git.ruby-lang.org/ruby.git/commit/?id=adc709adb8

From adc709adb8c7fbe83a20b7c9b554856c98346a4b Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@h...>
Date: Thu, 26 May 2022 11:54:15 -0700
Subject: Don't attempt to read ivars on T_ICLASS in struct (#5664)

---
 struct.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/struct.c b/struct.c
index 44ca389f04..c95c88200b 100644
--- a/struct.c
+++ b/struct.c
@@ -43,13 +43,14 @@ struct_ivar_get(VALUE c, ID id) https://github.com/ruby/ruby/blob/trunk/struct.c#L43
 	return ivar;
 
     for (;;) {
-	c = RCLASS_SUPER(c);
-	if (c == 0 || c == rb_cStruct)
-	    return Qnil;
-	ivar = rb_attr_get(c, id);
-	if (!NIL_P(ivar)) {
-	    return rb_ivar_set(orig, id, ivar);
-	}
+        c = rb_class_superclass(c);
+        if (c == 0 || c == rb_cStruct)
+            return Qnil;
+        RUBY_ASSERT(RB_TYPE_P(c, T_CLASS));
+        ivar = rb_attr_get(c, id);
+        if (!NIL_P(ivar)) {
+            return rb_ivar_set(orig, id, ivar);
+        }
     }
 }
 
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