Index: std/range.d
===================================================================
--- std/range.d	(revision 1824)
+++ std/range.d	(working copy)
@@ -2564,7 +2564,7 @@
         this.pastLast += step;
     }
     /// Ditto
-    @property bool empty() const { return current == pastLast; }
+    @property bool empty() const { return step > 0 ? current >= pastLast : current <= pastLast; }
     /// Ditto
     @property N front() { return current; }
     /// Ditto
@@ -2708,6 +2708,17 @@
     copy(iota(0, idx.length), idx);
 }
 
+unittest
+{
+    // Issue 4603
+    auto a = array(iota(1, 0));
+    assert(a.length == 0);
+    auto b = array(iota(-1, 0));
+    assert(b.length == 1);
+    auto c = array(iota(-1, 0, -1));
+    assert(c.length == 0);
+}
+
 /**
 Options for the $(D FrontTransversal) and $(D Transversal) ranges
 (below).