https://git.ruby-lang.org/ruby.git/commit/?id=1351374bd1

From 1351374bd14d4d134726889ba195609b4f745ea6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 3 Jun 2020 08:40:11 +0900
Subject: Split visibility cases


diff --git a/vm_method.c b/vm_method.c
index 2b2e28e..d8d1552 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -1304,10 +1304,15 @@ rb_method_boundp(VALUE klass, ID id, int ex) https://github.com/ruby/ruby/blob/trunk/vm_method.c#L1304
     }
 
     if (me != NULL) {
-        if ((ex & ~BOUND_RESPONDS) &&
-	    ((METHOD_ENTRY_VISI(me) == METHOD_VISI_PRIVATE) ||
-	     ((ex & BOUND_RESPONDS) && (METHOD_ENTRY_VISI(me) == METHOD_VISI_PROTECTED)))) {
-	    return 0;
+        if (ex & ~BOUND_RESPONDS) {
+            switch (METHOD_ENTRY_VISI(me)) {
+              case METHOD_VISI_PRIVATE:
+                return 0;
+              case METHOD_VISI_PROTECTED:
+                if (ex & BOUND_RESPONDS) return 0;
+              default:
+                break;
+            }
 	}
 
 	if (me->def->type == VM_METHOD_TYPE_NOTIMPLEMENTED) {
-- 
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