diff --git a/include/clang/AST/AttrIterator.h b/include/clang/AST/AttrIterator.h
index e74405d..8bd8fbe 100644
--- a/include/clang/AST/AttrIterator.h
+++ b/include/clang/AST/AttrIterator.h
@@ -98,6 +98,7 @@
 
   friend bool operator==(specific_attr_iterator Left,
                          specific_attr_iterator Right) {
+    assert((Left.Current == 0) == (Right.Current == 0));
     if (Left.Current < Right.Current)
       Left.AdvanceToNext(Right.Current); 
     else
diff --git a/include/clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h b/include/clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h
index d7acb48..af2f365 100644
--- a/include/clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h
+++ b/include/clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h
@@ -651,9 +651,11 @@
     }
 
     bool operator==(const referenced_vars_iterator &I) const {
+      assert((R == 0) == (I.R == 0));
       return I.R == R;
     }
     bool operator!=(const referenced_vars_iterator &I) const {
+      assert((R == 0) == (I.R == 0));
       return I.R != R;
     }
     referenced_vars_iterator &operator++() {
diff --git a/lib/CodeGen/CGExprConstant.cpp b/lib/CodeGen/CGExprConstant.cpp
index 4344f94..e3e5d66 100644
--- a/lib/CodeGen/CGExprConstant.cpp
+++ b/lib/CodeGen/CGExprConstant.cpp
@@ -1214,6 +1214,8 @@
       if (I < NumInitElts)
         C = EmitConstantValueForMemory(Value.getArrayInitializedElt(I),
                                        CAT->getElementType(), CGF);
+      else
+        assert(Filler && "Missing filler for implicit elements of initializer");
       if (I == 0)
         CommonElementType = C->getType();
       else if (C->getType() != CommonElementType)
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index c21cf03..5fd775e 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -8859,7 +8859,7 @@
   DeclContext *PrevDC = CurContext;
   CurContext = Context.getTranslationUnitDecl();
 
-  FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
+  FunctionDecl *FD = cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
   FD->setImplicit();
 
   CurContext = PrevDC;
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index ce526a9..a2cbe11 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -5109,7 +5109,6 @@
   CXXRecordDecl *RD = MD->getParent();
 
   bool ConstArg = false;
-  ParmVarDecl *Param0 = MD->getNumParams() ? MD->getParamDecl(0) : 0;
 
   // C++11 [class.copy]p12, p25:
   //   A [special member] is trivial if its declared parameter type is the same
@@ -5124,6 +5123,7 @@
   case CXXCopyAssignment: {
     // Trivial copy operations always have const, non-volatile parameter types.
     ConstArg = true;
+    const ParmVarDecl *Param0 = MD->getParamDecl(0);
     const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>();
     if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) {
       if (Diagnose)
@@ -5139,6 +5139,7 @@
   case CXXMoveConstructor:
   case CXXMoveAssignment: {
     // Trivial move operations always have non-cv-qualified parameters.
+    const ParmVarDecl *Param0 = MD->getParamDecl(0);
     const RValueReferenceType *RT =
       Param0->getType()->getAs<RValueReferenceType>();
     if (!RT || RT->getPointeeType().getCVRQualifiers()) {
@@ -10225,8 +10226,8 @@
   bool Invalid = D.isInvalidType();
 
   // Check for unexpanded parameter packs.
-  if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
-                                               UPPC_ExceptionType)) {
+  if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
+                                      UPPC_ExceptionType)) {
     TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 
                                              D.getIdentifierLoc());
     Invalid = true;
diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp
index 43b097d..66fdc67 100644
--- a/lib/Sema/SemaDeclObjC.cpp
+++ b/lib/Sema/SemaDeclObjC.cpp
@@ -394,7 +394,7 @@
     // Then in ActOnSuperMessage() (SemaExprObjC), set it back to false.
     // Finally, in ActOnFinishFunctionBody() (SemaDecl), warn if flag is set.
     // Only do this if the current class actually has a superclass.
-    if (IC->getSuperClass()) {
+    if (const ObjCInterfaceDecl *SuperClass = IC->getSuperClass()) {
       ObjCMethodFamily Family = MDecl->getMethodFamily();
       if (Family == OMF_dealloc) {
         if (!(getLangOpts().ObjCAutoRefCount ||
@@ -407,8 +407,8 @@
         
       } else {
         const ObjCMethodDecl *SuperMethod =
-          IC->getSuperClass()->lookupMethod(MDecl->getSelector(),
-                                            MDecl->isInstanceMethod());
+          SuperClass->lookupMethod(MDecl->getSelector(),
+                                   MDecl->isInstanceMethod());
         getCurFunction()->ObjCShouldCallSuper = 
           (SuperMethod && SuperMethod->hasAttr<ObjCRequiresSuperAttr>());
       }
diff --git a/lib/Sema/SemaStmt.cpp b/lib/Sema/SemaStmt.cpp
index 9b7ba04..b5b35fc 100644
--- a/lib/Sema/SemaStmt.cpp
+++ b/lib/Sema/SemaStmt.cpp
@@ -2531,6 +2531,7 @@
       Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/;
     Result = new (Context) ReturnStmt(ReturnLoc);
   } else {
+    assert(RetValExp || FnRetType->isDependentType());
     const VarDecl *NRVOCandidate = 0;
     if (!FnRetType->isDependentType() && !RetValExp->isTypeDependent()) {
       // we have a non-void function with an expression, continue checking
diff --git a/lib/Sema/SemaType.cpp b/lib/Sema/SemaType.cpp
index 1c35442..0175177 100644
--- a/lib/Sema/SemaType.cpp
+++ b/lib/Sema/SemaType.cpp
@@ -3385,6 +3385,7 @@
 
       TypeSourceInfo *TInfo = 0;
       Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
+      assert(TInfo);
       TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
     }
 
diff --git a/lib/StaticAnalyzer/Core/ExprEngineC.cpp b/lib/StaticAnalyzer/Core/ExprEngineC.cpp
index 9bc8908..2f2eb86 100644
--- a/lib/StaticAnalyzer/Core/ExprEngineC.cpp
+++ b/lib/StaticAnalyzer/Core/ExprEngineC.cpp
@@ -649,6 +649,8 @@
     break;
   }
 
+  assert(SrcBlock && "missing function entry");
+
   // Find the last expression in the predecessor block.  That is the
   // expression that is used for the value of the ternary expression.
   bool hasValue = false;