https://git.ruby-lang.org/ruby.git/commit/?id=429ed8d587

From 429ed8d587423414fbbf2f562479c69562d52598 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Wed, 4 Sep 2019 14:37:13 -0700
Subject: Don't change DSTR nodes to ARRAY nodes

DSTR nodes are allocated in to the "markable" bucket where ARRAY nodes
are not.  Switching buckets can cause errors during GC.

diff --git a/parse.y b/parse.y
index 811c668..7a0bbe0 100644
--- a/parse.y
+++ b/parse.y
@@ -9611,9 +9611,7 @@ literal_concat(struct parser_params *p, NODE *head, NODE *tail, const YYLTYPE *l https://github.com/ruby/ruby/blob/trunk/parse.y#L9611
 	    goto append;
 	}
 	else {
-	    nd_set_type(tail, NODE_ARRAY);
-	    tail->nd_head = NEW_STR(tail->nd_lit, loc);
-	    list_concat(head, tail);
+	    list_concat(head, NEW_NODE(NODE_ARRAY, NEW_STR(tail->nd_lit, loc), tail->nd_alen, tail->nd_next, loc));
 	}
 	break;
 
-- 
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