diff --git a/changelog/pattern-deprecate.dd b/changelog/pattern-deprecate.dd
index 2fe5214fe66..12bedbeb189 100644
--- a/changelog/pattern-deprecate.dd
+++ b/changelog/pattern-deprecate.dd
@@ -8,3 +8,57 @@ $(MREF std, regex) and $(MREF std, algorithm). They will be removed from
 $(MREF std, string) on May 2018.
 
 If you still need to use these, please see $(LINK2 https://github.com/dlang/undeaD, undeaD).
+
+The following are examples of the deprecated functions, and their modern replacements.
+
+Use $(REF find, std, algorithm, searching) to replace $(REF munch, std, string):
+-------
+import std.algorithm;
+import std.ascii;
+import std.string;
+import std.utf;
+
+string s = "\tabc";
+
+// old
+s.munch(whitespace);
+
+// new
+s = s.find!(a => !isWhite(a));
+-------
+
+Use $(REF matchFirst, std, regex) to replace $(REF inPattern, std, string):
+-------
+import std.string;
+import std.regex;
+
+// old
+if (inPattern('x', "a-z")) { ... }
+
+// new
+if ("x".matchFirst(regex("[a-z]"))) { ... }
+-------
+
+Use $(REF replaceAll, std, regex) to replace $(REF removechars, std, string):
+-------
+import std.string;
+import std.regex;
+
+// old
+"abc".removechars("a-z");
+
+// new
+"abc".replaceAll(regex("[a-z]"), "");
+-------
+
+Use $(REF uniq, std, algorithm, iteration) to replace $(REF squeeze, std, string):
+-------
+import std.algorithm;
+import std.string;
+
+// old
+"hello".squeeze;
+
+// new
+"hello".uniq;
+-------
diff --git a/changelog/split-std-datetime.dd b/changelog/split-std-datetime.dd
index 656979a6cac..13f080340ec 100644
--- a/changelog/split-std-datetime.dd
+++ b/changelog/split-std-datetime.dd
@@ -28,7 +28,7 @@ $(MREF std,datetime,timezone) contains the time zone types.
 $(MREF std,datetime,package) contains StopWatch and the benchmarking functions
 (so, they can only be imported via std.datetime and not via a submodule). As
 those functions use $(REF TickDuration,core,time) (which is being replaced by
-$(REF MonoTime,core,time), they are slated for deprecation.
+$(REF MonoTime,core,time), they are slated for deprecation).
 
 $(MREF std,datetime,stopwatch) has been added. It contains versions of
 StopWatch and benchmark which have almost the same API as the existing symbols,
diff --git a/std/container/rbtree.d b/std/container/rbtree.d
index 5342b1692e4..7db3ca61408 100644
--- a/std/container/rbtree.d
+++ b/std/container/rbtree.d
@@ -627,8 +627,7 @@ struct RBNode(V)
 
     Node dup()
     {
-        Node copy = new RBNode!V;
-        copy.value = value;
+        Node copy = new RBNode!V(null, null, null, value);
         copy.color = color;
         if (_left !is null)
             copy.left = _left.dup();
@@ -801,9 +800,7 @@ if (is(typeof(binaryFun!less(T.init, T.init))))
 
     static private Node allocate(Elem v)
     {
-        auto result = allocate();
-        result.value = v;
-        return result;
+        return new RBNode(null, null, null, v);
     }
 
     /**
@@ -1190,7 +1187,8 @@ if (is(typeof(binaryFun!less(T.init, T.init))))
         else
         {
             assert(ts.length == 5);
-            assert(ts.stableInsert(cast(Elem[])[7, 8, 6, 9, 10, 8]) == 5);
+            Elem[] elems = [7, 8, 6, 9, 10, 8];
+            assert(ts.stableInsert(elems) == 5);
             assert(ts.length == 10);
             assert(ts.stableInsert(cast(Elem) 11) == 1 && ts.length == 11);
             assert(ts.stableInsert(cast(Elem) 7) == 0 && ts.length == 11);
@@ -1398,11 +1396,7 @@ assert(equal(rbt[], [5]));
     size_t removeKey(U...)(U elems)
         if (allSatisfy!(isImplicitlyConvertibleToElem, U))
     {
-        Elem[U.length] toRemove;
-
-        foreach (i, e; elems)
-            toRemove[i] = e;
-
+        Elem[U.length] toRemove = [elems];
         return removeKey(toRemove[]);
     }
 
@@ -2056,3 +2050,16 @@ if ( is(typeof(binaryFun!less((ElementType!Stuff).init, (ElementType!Stuff).init
     class C {}
     RedBlackTree!(C, "cast(void*)a < cast(void*) b") tree;
 }
+
+@safe pure unittest // const/immutable elements (issue 17519)
+{
+    RedBlackTree!(immutable int) t1;
+    RedBlackTree!(const int) t2;
+
+    import std.algorithm.iteration : map;
+    static struct S { int* p; }
+    auto t3 = new RedBlackTree!(immutable S, (a, b) => *a.p < *b.p);
+    t3.insert([1, 2, 3].map!(x => immutable S(new int(x))));
+    static assert(!__traits(compiles, *t3.front.p = 4));
+    assert(*t3.front.p == 1);
+}
diff --git a/std/file.d b/std/file.d
index 1fff42df695..d39093a37fe 100644
--- a/std/file.d
+++ b/std/file.d
@@ -4178,8 +4178,8 @@ auto dirEntries(string path, string pattern, SpanMode mode,
  * Reads a file line by line and parses the line into a single value or a
  * $(REF Tuple, std,typecons) of values depending on the length of `Types`.
  * The lines are parsed using the specified format string. The format string is
- * passed to $(REF formattedRead, std,format), and therefore must conform to the
- * format string specification outlined in $(MREF format).
+ * passed to $(REF formattedRead, std,_format), and therefore must conform to the
+ * format string specification outlined in $(MREF std, _format).
  *
  * Params:
  *     Types = the types that each of the elements in the line should be returned as
@@ -4193,7 +4193,7 @@ auto dirEntries(string path, string pattern, SpanMode mode,
  * Throws:
  *     `Exception` if the format string is malformed. Also, throws `Exception`
  *     if any of the lines in the file are not fully consumed by the call
- *     to $(REF formattedRead, std,format). Meaning that no empty lines or lines
+ *     to $(REF formattedRead, std,_format). Meaning that no empty lines or lines
  *     with extra characters are allowed.
  */
 Select!(Types.length == 1, Types[0][], Tuple!(Types)[])