Send the backtrace of the circular require warning as a single String to Warning.warn

* load.c: send as a single string.
* error.c: expose the string formatted by rb_warning as rb_warning_string().
* test/ruby/test_exception.rb: update tests.
  [ruby-core:80850] [Bug #13505]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58493 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/error.c b/error.c
index 709fcf3612..5c21229cbd 100644
--- a/error.c
+++ b/error.c
@@ -268,6 +268,14 @@ rb_warning(const char *fmt, ...)
     }
 }
 
+VALUE
+rb_warning_string(const char *fmt, ...)
+{
+    with_warning_string(mesg, 0, fmt) {
+    }
+    return mesg;
+}
+
 #if 0
 void
 rb_enc_warning(rb_encoding *enc, const char *fmt, ...)