Merge pull request #2853 from mellinoe/revert-range-optimization

Revert range optimization

Author: stephentoub

src/System.Linq/src/System/Linq/Enumerable.cs

@@ -1472,8 +1472,7 @@ public static IEnumerable<int> Range(int start, int count)
 
         private static IEnumerable<int> RangeIterator(int start, int count)
         {
-            for (int end = start + count; start < end; start++)
-                yield return start;
+            for (int i = 0; i < count; i++) yield return start + i;
         }
 
         public static IEnumerable<TResult> Repeat<TResult>(TResult element, int count)

src/System.Linq/tests/RangeTests.cs

@@ -92,5 +92,18 @@ public void Range_GetEnumeratorReturnUniqueInstances()
                 Assert.NotSame(enum1, enum2);
             }
         }
+
+        [Fact]
+        public void Range_ToInt32MaxValue()
+        {
+            int from = Int32.MaxValue - 3;
+            int count = 4;
+            var rangeEnumerable = Enumerable.Range(from, count);
+
+            Assert.Equal(count, rangeEnumerable.Count());
+
+            int[] expected = { Int32.MaxValue - 3, Int32.MaxValue - 2, Int32.MaxValue - 1, Int32.MaxValue };
+            Assert.Equal(expected, rangeEnumerable);
+        }
     }
 }