* time.c (num_exact): use to_r method only if to_int method is

  available.
  [ruby-core:53764] [Bug #8173] reported by Hiro Asari.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39967 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/time.c b/time.c
index b89665ccda..14f29118ac 100644
--- a/time.c
+++ b/time.c
@@ -683,7 +683,9 @@ num_exact(VALUE v)
 
       default:
         if ((tmp = rb_check_funcall(v, rb_intern("to_r"), 0, NULL)) != Qundef) {
-            if (rb_respond_to(v, rb_intern("to_str"))) goto typeerror;
+            /* test to_int method availability to reject non-Numeric
+             * objects such as String, Time, etc which have to_r method. */
+            if (!rb_respond_to(v, rb_intern("to_int"))) goto typeerror;
             v = tmp;
             break;
         }