Index: lib/Lex/Preprocessor.cpp
===================================================================
--- lib/Lex/Preprocessor.cpp
+++ lib/Lex/Preprocessor.cpp
@@ -625,8 +625,23 @@
   bool UsingPragmaHdrStop = SkippingUntilPragmaHdrStop;
   Token Tok;
   while (true) {
-    bool InPredefines = (CurLexer->getFileID() == getPredefinesFileID());
-    CurLexer->Lex(Tok);
+    bool InPredefines =
+        (CurLexer && CurLexer->getFileID() == getPredefinesFileID());
+    switch (CurLexerKind) {
+    case CLK_Lexer:
+      CurLexer->Lex(Tok);
+     break;
+    case CLK_TokenLexer:
+      CurTokenLexer->Lex(Tok);
+      break;
+    case CLK_CachingLexer:
+      bool IsNewToken;
+      CachingLex(Tok, IsNewToken);
+      break;
+    case CLK_LexAfterModuleImport:
+      LexAfterModuleImport(Tok);
+      break;
+    }
     if (Tok.is(tok::eof) && !InPredefines) {
       ReachedMainFileEOF = true;
       break;
Index: test/PCH/Inputs/pch-through-macro.h
===================================================================
--- test/PCH/Inputs/pch-through-macro.h
+++ test/PCH/Inputs/pch-through-macro.h
@@ -0,0 +1,3 @@
+#pragma once
+#define Source(x,y)
+#define InOut(size) Source(InOut, (size))
Index: test/PCH/pch-through4.cpp
===================================================================
--- test/PCH/pch-through4.cpp
+++ test/PCH/pch-through4.cpp
@@ -0,0 +1,12 @@
+// expected-no-diagnostics
+// Create PCH with #pragma hdrstop processing.
+// RUN: %clang_cc1 -verify -I %S -emit-pch -pch-through-hdrstop-create \
+// RUN:   -fms-extensions -o %t.pch -x c++-header %s
+
+// Create the PCH object
+// RUN: %clang_cc1 -verify -I %S -emit-obj -include-pch %t.pch \
+// RUN:   -pch-through-hdrstop-create -fms-extensions -o %t.obj -x c++ %s
+
+#pragma once
+#include "Inputs/pch-through-macro.h"
+void f(InOut(a) char *b, unsigned long a);
Index: test/PCH/pch-through4a.cpp
===================================================================
--- test/PCH/pch-through4a.cpp
+++ test/PCH/pch-through4a.cpp
@@ -0,0 +1,16 @@
+// expected-no-diagnostics
+// Create PCH with a through header.
+// RUN: %clang_cc1 -verify -I %S -emit-pch \
+// RUN: -pch-through-header=Inputs/pch-through1.h \
+// RUN:   -fms-extensions -o %t.pch -x c++-header %s
+
+// Create the PCH object
+// RUN: %clang_cc1 -verify -I %S -emit-obj -include-pch %t.pch \
+// RUN:   -pch-through-header=Inputs/pch-through1.h \
+// RUN:   -fms-extensions -o %t.obj -x c++ %s
+
+#define Source(x,y)
+#define InOut(size) Source(InOut, (size))
+void f(InOut(a) char *b, unsigned long a);
+#include "Inputs/pch-through1.h"
+int other;