* 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/string.c b/string.c
index 1b7c2152f5..d2fdc44806 100644
--- a/string.c
+++ b/string.c
@@ -773,7 +773,12 @@ rb_str_equal(str1, str2)
     VALUE str1, str2;
 {
     if (str1 == str2) return Qtrue;
-    if (TYPE(str2) != T_STRING) return Qfalse;
+    if (TYPE(str2) != T_STRING) {
+	if (!rb_respond_to(str2, rb_intern("to_str"))) {
+	    return Qfalse;
+	}
+	return rb_equal(str2, str1);
+    }
     if (RSTRING(str1)->len == RSTRING(str2)->len &&
 	rb_str_cmp(str1, str2) == 0) {
 	return Qtrue;