private ExternalValueExpression DeriveMemberAccessParameter(ExternalValueExpression oldPrm, MemberInfo memberInfo, TranslationContext context)
{
MemberExpression newSource = Expression.MakeMemberAccess(oldPrm.SourceExpression, memberInfo);
Expression safeNewSource = newSource;
if(!memberInfo.IsStaticMember() && oldPrm.Type.IsInterface)
safeNewSource = MakeSafeEntityParameterMemberAccess(newSource);
return DeriveInputParameter(oldPrm, safeNewSource, context);
}