From dc21024ec795bcfcd3018825fa3c272731439a7e Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Tue, 25 Jun 2019 18:05:33 +0900
Subject: Fix `mrb_str_to_str()` to handle symbols.

---
 src/string.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/string.c b/src/string.c
index ed58c484b..856e908af 100644
--- a/src/string.c
+++ b/src/string.c
@@ -973,6 +973,8 @@ mrb_str_to_str(mrb_state *mrb, mrb_value str)
   switch (mrb_type(str)) {
   case MRB_TT_STRING:
     return str;
+  case MRB_TT_SYMBOL:
+    return mrb_sym2str(mrb, mrb_symbol(str));
   case MRB_TT_FIXNUM:
     return mrb_fixnum_to_str(mrb, str, 10);
   case MRB_TT_CLASS:
-- 
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