Index: cfe/trunk/lib/Sema/TreeTransform.h
===================================================================
--- cfe/trunk/lib/Sema/TreeTransform.h
+++ cfe/trunk/lib/Sema/TreeTransform.h
@@ -6601,8 +6601,7 @@
 
   // Rebuild the switch statement.
   StmtResult Switch
-    = getDerived().RebuildSwitchStmtStart(S->getSwitchLoc(),
-                                          S->getInit(), Cond);
+    = getDerived().RebuildSwitchStmtStart(S->getSwitchLoc(), Init.get(), Cond);
   if (Switch.isInvalid())
     return StmtError();
 
Index: cfe/trunk/test/SemaCXX/cxx1z-init-statement-template.cpp
===================================================================
--- cfe/trunk/test/SemaCXX/cxx1z-init-statement-template.cpp
+++ cfe/trunk/test/SemaCXX/cxx1z-init-statement-template.cpp
@@ -0,0 +1,32 @@
+// RUN: %clang_cc1 -std=c++1z -verify -emit-llvm-only %s
+// expected-no-diagnostics
+
+// rdar://problem/33888545
+template <unsigned int BUFFER_SIZE> class Buffer {};
+
+class A {
+public:
+  int status;
+};
+
+template <unsigned int N> A parse(Buffer<N> buffer);
+
+template<unsigned int N>
+void init_in_if(Buffer<N> buffer) {
+  if (A a = parse(buffer); a.status > 0) {
+  }
+}
+
+template<unsigned int N>
+void init_in_switch(Buffer<N> buffer) {
+  switch (A a = parse(buffer); a.status) {
+    default:
+      break;
+  }
+}
+
+void test() {
+  Buffer<10> buffer;
+  init_in_if(buffer);
+  init_in_switch(buffer);
+}