Attribute types definitions for using C# 5 caller info attributes in projects targeting earlier frameworks i.e. before .NET 4.5

CompilerServicesExtensions

namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Parameter, Inherited = false)]
    public sealed class CallerMemberNameAttribute : Attribute
    {
        public CallerMemberNameAttribute()
        { }
    }

    [AttributeUsage(AttributeTargets.Parameter, Inherited = false)]
    public sealed class CallerFilePathAttribute : Attribute
    {
        public CallerFilePathAttribute()
        {
        }
    }

    [AttributeUsage(AttributeTargets.Parameter, Inherited = false)]
    public sealed class CallerLineNumberAttribute : Attribute
    {
        public CallerLineNumberAttribute()
        {
        }
    }
}