From e207d5af43e9d6e09679e9aee9bf00a843528e0e Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Wed, 19 Sep 2018 21:51:53 +0900
Subject: Remove implicit conversion using `to_str` method.

We have added internal convenience method `__to_str` which
does string type check.
---
 src/class.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/class.c')

diff --git a/src/class.c b/src/class.c
index 76c699881..7d7e6216c 100644
--- a/src/class.c
+++ b/src/class.c
@@ -504,10 +504,17 @@ check_type(mrb_state *mrb, mrb_value val, enum mrb_vtype t, const char *c, const
   return tmp;
 }
 
+#define CHECK_TYPE(mrb, val, t, c) do { \
+  if (mrb_type(val) != (t)) {\
+    mrb_raisef(mrb, E_TYPE_ERROR, "expected %S", mrb_str_new_lit(mrb, c));\
+  }\
+} while (0)
+
 static mrb_value
 to_str(mrb_state *mrb, mrb_value val)
 {
-  return check_type(mrb, val, MRB_TT_STRING, "String", "to_str");
+  CHECK_TYPE(mrb, val, MRB_TT_STRING, "String");
+  return val;
 }
 
 static mrb_value
-- 
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