* array.c (ary_partial0): recovers mistakenly feature change at r19723.

Array#[m,n] had returned an Array even for an instance of a
  subclass.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@20076 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Fri Oct 31 18:42:19 2008  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
+
+	* array.c (ary_partial0): recovers mistakenly feature change at r19723.
+	  Array#[m,n] had returned an Array even for an instance of a
+	  subclass.
+
 Fri Oct 31 18:05:05 2008  Martin Duerst  <duerst@it.aoyama.ac.jp>
 
 	* enc/trans/single_byte.trans, maccroatioan-tbl.rb,

array.c

@@ -610,7 +610,10 @@ ary_make_partial0(VALUE ary, long offset, long len)
     assert(offset+len <= RARRAY_LEN(ary));
 
     if (len <= RARRAY_EMBED_LEN_MAX) {
-        return rb_ary_new4(len, RARRAY_PTR(ary) + offset);
+        VALUE result = ary_alloc(rb_obj_class(ary));
+        MEMCPY(ARY_EMBED_PTR(result), RARRAY_PTR(ary) + offset, VALUE, len);
+        ARY_SET_EMBED_LEN(result, len);
+        return result;
     }
     else {
         VALUE shared, result = ary_alloc(rb_obj_class(ary));