diff --git a/lib/Sema/SemaTemplateDeduction.cpp b/lib/Sema/SemaTemplateDeduction.cpp
index 16d5afb..64ef819 100644
--- a/lib/Sema/SemaTemplateDeduction.cpp
+++ b/lib/Sema/SemaTemplateDeduction.cpp
@@ -3826,8 +3826,7 @@
   if (Args.size() < Function->getMinRequiredArguments() && !PartialOverloading)
     return TDK_TooFewArguments;
   else if (TooManyArguments(NumParams, Args.size(), PartialOverloading)) {
-    const FunctionProtoType *Proto
-      = Function->getType()->getAs<FunctionProtoType>();
+    const auto *Proto = Function->getType()->castAs<FunctionProtoType>();
     if (Proto->isTemplateVariadic())
       /* Do nothing */;
     else if (!Proto->isVariadic())
@@ -3965,11 +3964,8 @@
   if (ArgFunctionType.isNull())
     return ArgFunctionType;
 
-  const FunctionProtoType *FunctionTypeP =
-      FunctionType->castAs<FunctionProtoType>();
-  const FunctionProtoType *ArgFunctionTypeP =
-      ArgFunctionType->getAs<FunctionProtoType>();
-
+  const auto *FunctionTypeP = FunctionType->castAs<FunctionProtoType>();
+  const auto *ArgFunctionTypeP = ArgFunctionType->castAs<FunctionProtoType>();
   FunctionProtoType::ExtProtoInfo EPI = ArgFunctionTypeP->getExtProtoInfo();
   bool Rebuild = false;