Index: include/llvm/ADT/Twine.h
===================================================================
--- include/llvm/ADT/Twine.h
+++ include/llvm/ADT/Twine.h
@@ -182,6 +182,10 @@
       assert(isValid() && "Invalid twine!");
     }
 
+    /// Since the intended use of twines is as temporary objects, assignments 
+    /// when concatenating might cause undefined behavior or stack corruptions
+    Twine& operator=(const Twine &Other) LLVM_DELETED_FUNCTION;
+
     /// isNull - Check for the null twine.
     bool isNull() const {
       return getLHSKind() == NullKind;