Fix rb_ary_sum for mathn

* array.c (rb_ary_sum): fix for mathn

* test/ruby/test_array.rb (test_sum): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54870 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sun May  1 23:59:59 2016  Kenta Murata  <mrkn@mrkn.jp>
+
+	* array.c (rb_ary_sum): fix for mathn
+
+	* test/ruby/test_array.rb (test_sum): ditto.
+
 Sun May  1 23:51:54 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* test/lib/test/unit.rb (Options#non_options): fixed wrong regexp.

array.c

@@ -5732,15 +5732,29 @@ rb_ary_sum(int argc, VALUE *argv, VALUE ary)
     }
     if (n != 0)
         v = rb_fix_plus(LONG2FIX(n), v);
-    if (r != Qundef)
-        v = rb_rational_plus(r, v);
+    if (r != Qundef) {
+        /* r can be a Integer when mathn is loaded */
+        if (FIXNUM_P(r))
+            v = rb_fix_plus(r, v);
+        else if (RB_TYPE_P(r, T_BIGNUM))
+            v = rb_big_plus(r, v);
+        else
+            v = rb_rational_plus(r, v);
+    }
     return v;
 
   not_exact:
     if (n != 0)
         v = rb_fix_plus(LONG2FIX(n), v);
-    if (r != Qundef)
-        v = rb_rational_plus(r, v);
+    if (r != Qundef) {
+        /* r can be a Integer when mathn is loaded */
+        if (FIXNUM_P(r))
+            v = rb_fix_plus(r, v);
+        else if (RB_TYPE_P(r, T_BIGNUM))
+            v = rb_big_plus(r, v);
+        else
+            v = rb_rational_plus(r, v);
+    }
 
     if (RB_FLOAT_TYPE_P(e)) {
         /* Kahan's compensated summation algorithm */

test/ruby/test_array.rb

@@ -2789,6 +2789,10 @@ def test_sum
 
     assert_equal("abc", ["a", "b", "c"].sum(""))
     assert_equal([1, [2], 3], [[1], [[2]], [3]].sum([]))
+
+    assert_separately(%w[-rmathn], <<-EOS, ignore_stderr: true)
+      assert_equal(6, [1r, 2, 3r].sum)
+    EOS
   end
 
   private