diff --git a/dmd2/expression.c b/dmd2/expression.c
index de9d1169..240e1261 100644
--- a/dmd2/expression.c
+++ b/dmd2/expression.c
@@ -11995,10 +11995,26 @@ Ltupleassign:
             warning("explicit element-wise assignment %s = (%s)[] is better than %s = %s",
                 e1str, e2str, e1str, e2str);
         }
-        if (op == TOKconstruct)
+
+        Type *t2n = t2->nextOf();
+        Type *t1n = t1->nextOf();
+        int offset;
+        if (t2n->immutableOf()->equals(t1n->immutableOf()) ||
+            t1n->isBaseOf(t2n, &offset) && offset == 0)
+        {
+            /* Allow copy of distinct qualifier elements.
+             * eg.
+             *  char[] dst;  const(char)[] src;
+             *  dst[] = src;
+             *
+             *  class C {}   class D : C {}
+             *  C[2] ca;  D[] da;
+             *  ca[] = da;
+             */
             e2 = e2->castTo(sc, e1->type->constOf());
+        }
         else
-            e2 = e2->implicitCastTo(sc, e1->type->constOf());
+            e2 = e2->implicitCastTo(sc, e1->type);
     }
     else
     {
diff --git a/dmd2/parse.c b/dmd2/parse.c
index 05b125e4..0b080472 100644
--- a/dmd2/parse.c
+++ b/dmd2/parse.c
@@ -3081,6 +3081,7 @@ Dsymbols *Parser::parseDeclarations(StorageClass storage_class, utf8_t *comment)
             break;
         }
         case TOKtypedef:
+            deprecation("use of typedef is deprecated; use alias instead");
             tok = token.value;
             nextToken();
             break;
@@ -3285,7 +3286,8 @@ L2:
             error("no identifier for declarator %s", t->toChars());
 
         if (tok == TOKtypedef || tok == TOKalias)
-        {   Declaration *v;
+        {
+            Declaration *v;
             Initializer *init = NULL;
 
             /* Aliases can no longer have multiple declarators, storage classes,
@@ -3303,7 +3305,6 @@ L2:
             }
             if (tok == TOKtypedef)
             {
-                deprecation("use of typedef is deprecated; use alias instead");
                 v = new TypedefDeclaration(loc, ident, t, init);
             }
             else
diff --git a/runtime/phobos b/runtime/phobos
index eb7ed998..c50b93e5 160000
--- a/runtime/phobos
+++ b/runtime/phobos
@@ -1 +1 @@
-Subproject commit eb7ed99822fe5abc92ec58aa8c6ef190461526b4
+Subproject commit c50b93e5a3ae98a04657d18c2c68da5a15b4c59c