https://git.ruby-lang.org/ruby.git/commit/?id=9b751db99c

From 9b751db99cb70c1f63e34f92955442167079d330 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 29 Oct 2021 01:03:29 +0900
Subject: Fix script_lines in loaded iseq as nil

---
 compile.c              | 3 ++-
 test/ruby/test_iseq.rb | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/compile.c b/compile.c
index 62a047be78c..9d3b91beb72 100644
--- a/compile.c
+++ b/compile.c
@@ -11835,7 +11835,8 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset) https://github.com/ruby/ruby/blob/trunk/compile.c#L11835
 
     ISEQ_COVERAGE_SET(iseq, Qnil);
     ISEQ_ORIGINAL_ISEQ_CLEAR(iseq);
-    iseq->body->variable.flip_count = variable_flip_count;
+    load_body->variable.flip_count = variable_flip_count;
+    load_body->variable.script_lines = Qnil;
 
     load_body->location.first_lineno = location_first_lineno;
     load_body->location.node_id = location_node_id;
diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index edd131823e2..7125a5ac6d8 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -464,6 +464,11 @@ class TestISeq < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_iseq.rb#L464
     a1 = iseq.to_a
     a2 = iseq2.to_a
     assert_equal(a1, a2, message(mesg) {diff iseq.disassemble, iseq2.disassemble})
+    if iseq2.script_lines
+      assert_kind_of(Array, iseq2.script_lines)
+    else
+      assert_nil(iseq2.script_lines)
+    end
     iseq2
   end
 
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