https://git.ruby-lang.org/ruby.git/commit/?id=d2ac6d4d9f

From d2ac6d4d9f57b34eeb94bd6302b54a632051ce64 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 22 Dec 2019 14:45:42 +0900
Subject: Manage deprecation warning by the flag


diff --git a/compile.c b/compile.c
index c19112c..56b91bf 100644
--- a/compile.c
+++ b/compile.c
@@ -7108,8 +7108,10 @@ check_yield_place(const rb_iseq_t *iseq, int line) https://github.com/ruby/ruby/blob/trunk/compile.c#L7108
         return FALSE;
       case ISEQ_TYPE_CLASS:
         file = rb_iseq_path(iseq);
-        rb_compile_warn(RSTRING_PTR(file), line,
-                        "`yield' in class syntax will not be supported from Ruby 3.0. [Feature #15575]");
+        if (rb_warning_category_enabled_p(RB_WARN_CATEGORY_DEPRECATED)) {
+            rb_compile_warn(RSTRING_PTR(file), line,
+                            "`yield' in class syntax will not be supported from Ruby 3.0. [Feature #15575]");
+        }
         return TRUE;
       default:
         return TRUE;
-- 
cgit v0.10.2


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