diff --git a/std/algorithm/iteration.d b/std/algorithm/iteration.d
index 8c7b42f8d..8323688ff 100644
--- a/std/algorithm/iteration.d
+++ b/std/algorithm/iteration.d
@@ -2534,8 +2534,10 @@ template reduce(fun...) if (fun.length >= 1)
         foreach (/+auto ref+/ E e; r) // @@@4707@@@
         {
             foreach (i, f; binfuns)
-                static assert(is(typeof(args[i] = f(args[i], e))),
+            {
+                static assert(!is(typeof(f(args[i], e))) || is(typeof(args[i] = f(args[i], e))),
                     algoFormat("Incompatible function/seed/element: %s/%s/%s", fullyQualifiedName!f, Args[i].stringof, E.stringof));
+            }
 
             static if (mustInitialize) if (initialized == false)
             {
diff --git a/std/container/slist.d b/std/container/slist.d
index b015aec7b..1db510450 100644
--- a/std/container/slist.d
+++ b/std/container/slist.d
@@ -430,6 +430,7 @@ assert(std.algorithm.equal(sl[], ["a", "b", "c", "d", "e"]));
 
     size_t insertAfter(Stuff)(Range r, Stuff stuff)
     {
+        initialize();
         if (!_first)
         {
             enforce(!r._head);
@@ -761,3 +762,11 @@ unittest
     r.front = 1; //test frontAssign
     assert(r.front == 1);
 }
+
+unittest
+{
+    // issue 14920
+    SList!int s;
+    s.insertAfter(s[], 1);
+    assert(s.front == 1);
+}
diff --git a/std/internal/cstring.d b/std/internal/cstring.d
index 43f946bee..bfacdb31f 100644
--- a/std/internal/cstring.d
+++ b/std/internal/cstring.d
@@ -90,7 +90,7 @@ auto tempCString(To = char, From)(From str)
 
     alias CF = Unqual!(ElementEncodingType!From);
 
-    enum To* useStack = null;
+    enum To* useStack = () @trusted { return cast(To*)size_t.max; }();
 
     static struct Res
     {
@@ -182,7 +182,14 @@ auto tempCString(To = char, From)(From str)
     }
     import std.utf : byUTF;
     static if (isSomeString!From)
+    {
         auto r = cast(const(CF)[])str;  // because inout(CF) causes problems with byUTF
+        if (r is null)  // Bugzilla 14980
+        {
+            res._ptr = null;
+            return res;
+        }
+    }
     else
         alias r = str;
     foreach (const c; byUTF!(Unqual!To)(r))
@@ -232,8 +239,14 @@ nothrow @nogc unittest
     assert(tempCString(abc[].byWchar).buffPtr.asArray == abc);
 }
 
+// Bugzilla 14980
+nothrow @nogc unittest
+{
+    const(char[]) str = null;
+    auto res = tempCString(str);
+    const char* ptr = res;
+    assert(ptr is null);
+}
 
 version(Windows)
     alias tempCStringW = tempCString!(wchar, const(char)[]);
-
-
diff --git a/std/range/package.d b/std/range/package.d
index c89727f76..ea520914f 100644
--- a/std/range/package.d
+++ b/std/range/package.d
@@ -2824,36 +2824,13 @@ auto generate(Fun)(Fun fun)
     return Generator!(Fun)(fun);
 }
 
-///
+/// ditto
 auto generate(alias fun)()
     if (isCallable!fun)
 {
     return Generator!(fun)();
 }
 
-//private struct Generator(bool onPopFront, bool runtime, Fun...)
-private struct Generator(Fun...)
-{
-    static assert(Fun.length == 1);
-    static assert(isInputRange!Generator);
-
-private:
-    static if (is(Fun[0]))
-        Fun[0] fun;
-    else
-        alias fun = Fun[0];
-
-public:
-    enum empty = false;
-
-    auto ref front() @property
-    {
-        return fun();
-    }
-
-    void popFront() { }
-}
-
 ///
 @safe pure unittest
 {
@@ -2879,6 +2856,38 @@ public:
     assert(equal(generate(infiniteIota(1, 4)).take(10), [1, 2, 3, 1, 2, 3, 1, 2, 3, 1]));
 }
 
+///
+unittest
+{
+    import std.format, std.random;
+
+    auto r = generate!(() => uniform(0, 6)).take(10);
+    format("%(%s %)", r);
+}
+
+//private struct Generator(bool onPopFront, bool runtime, Fun...)
+private struct Generator(Fun...)
+{
+    static assert(Fun.length == 1);
+    static assert(isInputRange!Generator);
+
+private:
+    static if (is(Fun[0]))
+        Fun[0] fun;
+    else
+        alias fun = Fun[0];
+
+public:
+    enum empty = false;
+
+    auto ref front() @property
+    {
+        return fun();
+    }
+
+    void popFront() { }
+}
+
 @safe unittest
 {
     import std.algorithm : equal;
diff --git a/std/socket.d b/std/socket.d
index cc790ba1b..ea0803b17 100644
--- a/std/socket.d
+++ b/std/socket.d
@@ -1061,6 +1061,12 @@ unittest
             assert(results.length && results[0].family == AddressFamily.INET6);
         }
     });
+
+    if (getaddrinfoPointer)
+    {
+        auto results = getAddressInfo(null, "1234", AddressInfoFlags.PASSIVE, SocketType.STREAM, ProtocolType.TCP, AddressFamily.INET);
+        assert(results.length == 1 && results[0].address.toString() == "0.0.0.0:1234");
+    }
 }