https://git.ruby-lang.org/ruby.git/commit/?id=e691e671ca

From e691e671ca91d125edb636669f628d51c04aa1b2 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Thu, 10 Sep 2020 21:04:00 +0900
Subject: Removed Thread#safe_level


diff --git a/thread.c b/thread.c
index 4b563a5..2f265c5 100644
--- a/thread.c
+++ b/thread.c
@@ -3269,23 +3269,6 @@ rb_thread_stop_p(VALUE thread) https://github.com/ruby/ruby/blob/trunk/thread.c#L3269
 }
 
 /*
- *  call-seq:
- *     thr.safe_level   -> integer
- *
- *  Returns the safe level.
- *
- *  This method is obsolete because $SAFE is a process global state.
- *  Simply check $SAFE.
- */
-
-static VALUE
-rb_thread_safe_level(VALUE thread)
-{
-    rb_warn("Thread#safe_level will be removed in Ruby 3.0");
-    return UINT2NUM(GET_VM()->safe_level_);
-}
-
-/*
  * call-seq:
  *   thr.name   -> string
  *
@@ -5513,7 +5496,6 @@ Init_Thread(void) https://github.com/ruby/ruby/blob/trunk/thread.c#L5496
     rb_define_method(rb_cThread, "abort_on_exception=", rb_thread_abort_exc_set, 1);
     rb_define_method(rb_cThread, "report_on_exception", rb_thread_report_exc, 0);
     rb_define_method(rb_cThread, "report_on_exception=", rb_thread_report_exc_set, 1);
-    rb_define_method(rb_cThread, "safe_level", rb_thread_safe_level, 0);
     rb_define_method(rb_cThread, "group", rb_thread_group, 0);
     rb_define_method(rb_cThread, "backtrace", rb_thread_backtrace_m, -1);
     rb_define_method(rb_cThread, "backtrace_locations", rb_thread_backtrace_locations_m, -1);
-- 
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