* array.c (rb_ary_equal): a == b is true when b is non T_ARRAY

  object, if b has "to_ary" and b == a.

* hash.c (rb_hash_equal): a == b is true when b is non T_HASH
  object, if b has "to_hash" and b == a.

* string.c (rb_str_equal): a == b is true when b is non T_STRING
  object, if b has "to_str" and b == a.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3442 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 1 deletions

diff --git a/array.c b/array.c
index 2010e1306f..f4627870e3 100644
--- a/array.c
+++ b/array.c
@@ -1563,7 +1563,12 @@ rb_ary_equal(ary1, ary2)
     long i;
 
     if (ary1 == ary2) return Qtrue;
-    if (TYPE(ary2) != T_ARRAY) return Qfalse;
+    if (TYPE(ary2) != T_ARRAY) {
+	if (!rb_respond_to(ary2, rb_intern("to_str"))) {
+	    return Qfalse;
+	}
+	return rb_equal(ary2, ary1);
+    }
     if (RARRAY(ary1)->len != RARRAY(ary2)->len) return Qfalse;
     for (i=0; i<RARRAY(ary1)->len; i++) {
 	if (!rb_equal(RARRAY(ary1)->ptr[i], RARRAY(ary2)->ptr[i]))