* vm_eval.c (rb_f_loop): Support for loop.size

[Feature #6636]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37506 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_enumerator.rb

@@ -464,5 +464,9 @@ class TestEnumerator < Test::Unit::TestCase
     assert_equal 0,  [].cycle.size
     assert_equal 0,  [].cycle(5).size
   end
+
+  def test_size_for_loops
+    assert_equal Float::INFINITY, loop.size
+  end
 end
 

vm_eval.c

@@ -920,6 +920,11 @@ loop_i(void)
     return Qnil;
 }
 
+static VALUE
+rb_f_loop_size(VALUE self, VALUE args) {
+    return DBL2NUM(INFINITY);
+}
+
 /*
  *  call-seq:
  *     loop { block }
@@ -942,7 +947,7 @@ loop_i(void)
 static VALUE
 rb_f_loop(VALUE self)
 {
-    RETURN_ENUMERATOR(self, 0, 0);
+    RETURN_SIZED_ENUMERATOR(self, 0, 0, rb_f_loop_size);
     rb_rescue2(loop_i, (VALUE)0, 0, 0, rb_eStopIteration, (VALUE)0);
     return Qnil;		/* dummy */
 }