https://git.ruby-lang.org/ruby.git/commit/?id=ae5458f228

From ae5458f228a5477383e9c00425d85d50a3867817 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Wed, 12 Jan 2022 17:29:17 +0900
Subject: thread.c: Convert TAG_BREAK to a normal exception at thread top-level

[Bug #18475]
---
 test/ruby/test_enum.rb | 11 +++++++++++
 thread.c               |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/test/ruby/test_enum.rb b/test/ruby/test_enum.rb
index f6375a4ffc2..b0c43b9a7fa 100644
--- a/test/ruby/test_enum.rb
+++ b/test/ruby/test_enum.rb
@@ -461,6 +461,17 @@ class TestEnumerable < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_enum.rb#L461
       empty.first
       empty.block.call
     end;
+
+    bug18475 = '[ruby-dev:107059]'
+    assert_in_out_err([], <<-'end;', [], /unexpected break/, bug18475)
+      e = Enumerator.new do |g|
+        Thread.new do
+          g << 1
+        end.join
+      end
+
+      e.first
+    end;
   end
 
   def test_sort
diff --git a/thread.c b/thread.c
index 36723c6fc06..cf6e89327ef 100644
--- a/thread.c
+++ b/thread.c
@@ -830,6 +830,9 @@ thread_start_func_2(rb_thread_t *th, VALUE *stack_start) https://github.com/ruby/ruby/blob/trunk/thread.c#L830
     else {
         errinfo = th->ec->errinfo;
 
+        VALUE exc = rb_vm_make_jump_tag_but_local_jump(state, Qundef);
+        if (!NIL_P(exc)) errinfo = exc;
+
         if (state == TAG_FATAL) {
             if (th->invoke_type == thread_invoke_type_ractor_proc) {
                 rb_ractor_atexit(th->ec, Qnil);
-- 
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