https://git.ruby-lang.org/ruby.git/commit/?id=9b6460cacc

From 9b6460caccc125be6ba9f2dace9eaafbbe5bc438 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Wed, 25 Sep 2019 14:57:25 -0700
Subject: Remove mark array

We don't use this array anymore so we can remove it

diff --git a/iseq.c b/iseq.c
index f76b350..03fe1dd 100644
--- a/iseq.c
+++ b/iseq.c
@@ -339,9 +339,6 @@ rb_iseq_mark(const rb_iseq_t *iseq) https://github.com/ruby/ruby/blob/trunk/iseq.c#L339
 
         rb_iseq_mark_insn_storage(compile_data->insn.storage_head);
 
-        if (RTEST(compile_data->mark_ary)) {
-            rb_gc_mark(compile_data->mark_ary);
-        }
         RUBY_MARK_UNLESS_NULL(compile_data->err_info);
         if (RTEST(compile_data->catch_table_ary)) {
             rb_gc_mark(compile_data->catch_table_ary);
@@ -559,7 +556,6 @@ prepare_iseq_build(rb_iseq_t *iseq, https://github.com/ruby/ruby/blob/trunk/iseq.c#L556
 
     ISEQ_COMPILE_DATA_ALLOC(iseq);
     RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->err_info, err_info);
-    RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->mark_ary, rb_ary_tmp_new(3));
     RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->catch_table_ary, Qnil);
 
     ISEQ_COMPILE_DATA(iseq)->node.storage_head = ISEQ_COMPILE_DATA(iseq)->node.storage_current = new_arena();
diff --git a/iseq.h b/iseq.h
index f1d446c..5d24b81 100644
--- a/iseq.h
+++ b/iseq.h
@@ -90,7 +90,6 @@ ISEQ_ORIGINAL_ISEQ_ALLOC(const rb_iseq_t *iseq, long size) https://github.com/ruby/ruby/blob/trunk/iseq.h#L90
 struct iseq_compile_data {
     /* GC is needed */
     const VALUE err_info;
-    VALUE mark_ary;
     const VALUE catch_table_ary;	/* Array */
 
     /* GC is not needed */
-- 
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