https://git.ruby-lang.org/ruby.git/commit/?id=94ab244b43

From 94ab244b43e1aa59dfef9f200b1c253f70975c7e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Mon, 29 Jun 2020 11:43:48 +0900
Subject: rb_class_modify_check: add UNREACHABLE

(I was not aware of this because I use clang, but) it seems gcc cannot
detect reachablility of this point.  It renders an unused variable
warning, which is a false positive.  Let us suppress the compiler.

https://github.com/ruby/ruby/runs/816997191#step:9:62

diff --git a/eval.c b/eval.c
index 03a1972..52f3cc4 100644
--- a/eval.c
+++ b/eval.c
@@ -489,6 +489,7 @@ rb_class_modify_check(VALUE klass) https://github.com/ruby/ruby/blob/trunk/eval.c#L489
 		break;
 	      default:
                 Check_Type(klass, T_CLASS);
+                UNREACHABLE;
 	    }
 	}
         rb_frozen_error_raise(klass, "can't modify frozen %s: %"PRIsVALUE, desc, klass);
-- 
cgit v0.10.2


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