gistfile1.txt

  auto PtrLiteral = new (S.Context) CXXNullPtrLiteralExpr(
      S.Context.NullPtrTy, NTTP->getLocation());
  Expr *Value =
      S.ImpCastExprToType(PtrLiteral, NullPtrType, CK_NullToPointer)
          .get();


    DeducedTemplateArgument NewDeduced(S.Context.getCanonicalTemplateName(Arg));
    DeducedTemplateArgument Result = checkDeducedTemplateArguments(
        S.Context,
        Deduced[TempParam->getIndex()],
        NewDeduced);


Sema::SubstituteExplicitTemplateArguments(
    FunctionTemplateDecl *FunctionTemplate,
    TemplateArgumentListInfo &ExplicitTemplateArgs,
    SmallVectorImpl<DeducedTemplateArgument> &Deduced,
    SmallVectorImpl<QualType> &ParamTypes,
    QualType *FunctionType,
    TemplateDeductionInfo &Info);