From 1870505f478cc75993b296b7144a45137ace6937 Mon Sep 17 00:00:00 2001
From: tomoya ishida <tomoyapenguin@gmail.com>
Date: Tue, 30 Jul 2024 15:31:58 +0900
Subject: [PATCH] Fix wrong unreachable chunk remove when jump destination
 label is unremovable

---
 compile.c              | 1 -
 test/ruby/test_iseq.rb | 5 +++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/compile.c b/compile.c
index c352ddc501..dfeb7ed284 100644
--- a/compile.c
+++ b/compile.c
@@ -3054,7 +3054,6 @@ remove_unreachable_chunk(rb_iseq_t *iseq, LINK_ELEMENT *i)
                 break;
             }
             else if ((lab = find_destination((INSN *)i)) != 0) {
-                if (lab->unremovable) break;
                 unref_counts[lab->label_no]++;
             }
         }
diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index c946d588c1..9429d8bc21 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -813,6 +813,11 @@ class TestISeq < Test::Unit::TestCase
   end
 
   def test_unreachable_pattern_matching
+    assert_in_out_err([], "true or 1 in 1")
+    assert_in_out_err([], "true or (case 1; in 1; 1; in 2; 2; end)")
+  end
+
+  def test_unreachable_pattern_matching_in_if_condition
     assert_in_out_err([], "#{<<~"begin;"}\n#{<<~'end;'}", %w[1])
     begin;
       if true or {a: 0} in {a:}