From ca96460a1e8405f9c2e875f5cae84f003c61fcc4 Mon Sep 17 00:00:00 2001
From: "H. S. Teoh" <hsteoh@quickfur.ath.cx>
Date: Thu, 28 Aug 2014 16:49:24 -0700
Subject: [PATCH 1/2] Fix regression 13393.

Caused by .save failing to save entire state, causing inconsistency in
.save'd objects.
---
 std/algorithm.d | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/std/algorithm.d b/std/algorithm.d
index b9e8f0da5fd..56b875d969b 100644
--- a/std/algorithm.d
+++ b/std/algorithm.d
@@ -13229,6 +13229,7 @@ auto cartesianProduct(RR...)(RR ranges)
                 copy.ranges[i] = r.save;
                 copy.current[i] = current[i].save;
             }
+            copy.empty = this.empty;
             return copy;
         }
     }
@@ -13261,6 +13262,13 @@ unittest
     assert(cprod.init.empty);
 }
 
+unittest
+{
+    // Issue 13393
+    import std.string : format;
+    auto result = format("%s", [cartesianProduct([0],[0],[0])].joiner);
+}
+
 /// ditto
 auto cartesianProduct(R1, R2, RR...)(R1 range1, R2 range2, RR otherRanges)
     if (!allSatisfy!(isForwardRange, R1, R2, RR) ||

From 6e310878172555aa7b6599a3f2a7047c309621b8 Mon Sep 17 00:00:00 2001
From: "H. S. Teoh" <hsteoh@quickfur.ath.cx>
Date: Thu, 28 Aug 2014 17:03:07 -0700
Subject: [PATCH 2/2] Simplify unittest.

---
 std/algorithm.d | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/std/algorithm.d b/std/algorithm.d
index 56b875d969b..e20f823a937 100644
--- a/std/algorithm.d
+++ b/std/algorithm.d
@@ -13265,8 +13265,7 @@ unittest
 unittest
 {
     // Issue 13393
-    import std.string : format;
-    auto result = format("%s", [cartesianProduct([0],[0],[0])].joiner);
+    assert(!cartesianProduct([0],[0],[0]).save.empty);
 }
 
 /// ditto