From 03e7997fd0f231334c8fb8ce0af1ef6f4161351a Mon Sep 17 00:00:00 2001
From: Max Schwenk <maschwenk@gmail.com>
Date: Thu, 20 Sep 2018 21:47:05 -0700
Subject: [PATCH] Don't mutated passed options

---
 ext/redcarpet/rc_markdown.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ext/redcarpet/rc_markdown.c b/ext/redcarpet/rc_markdown.c
index 905148e7..df016fbb 100644
--- a/ext/redcarpet/rc_markdown.c
+++ b/ext/redcarpet/rc_markdown.c
@@ -115,8 +115,8 @@ static VALUE rb_redcarpet_md__new(int argc, VALUE *argv, VALUE klass)
 
 	/* Merge the current options in the @options hash */
 	if (hash != Qnil) {
-		rndr_options = rb_iv_get(rb_rndr, "@options");
-		rb_funcall(rndr_options, rb_intern("merge!"), 1, hash);
+		rndr_options = rb_funcall(rb_iv_get(rb_rndr, "@options"), rb_intern("merge"), 1, hash);
+		rb_iv_set(rb_rndr, "@options", rndr_options);
 	}
 
 	markdown = sd_markdown_new(extensions, 16, &rndr->callbacks, &rndr->options);