error.c: print default RS

* error.c (rb_warn_m): print the default RS instead of an empty
  string with a newline.  [Feature #12944]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57377 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/error.c b/error.c
index d4c38f8cbb..0ec0cf895a 100644
--- a/error.c
+++ b/error.c
@@ -303,7 +303,10 @@ rb_warn_m(int argc, VALUE *argv, VALUE exc)
 	VALUE str;
 	for (i = 0; i < argc; i++) {
 	    str = rb_obj_as_string(argv[i]);
-	    if (RSTRING_LEN(str) == 0 || !rb_str_end_with_asciichar(str, '\n')) {
+	    if (RSTRING_LEN(str) == 0) {
+		str = rb_default_rs;
+	    }
+	    else if (!rb_str_end_with_asciichar(str, '\n')) {
 		str = rb_str_cat(rb_str_dup(str), "\n", 1);
 	    }
 	    rb_write_warning_str(str);