Why is nameof(object) not allowed?

Question

In C# 6.0 you can write this:

var instance = default(object);
var type = typeof(object);

They have the same result of:

var instance = default(System.Object);
var type = typeof(System.Object);

But you can't write this:

var name = nameof(object);

It generates the following error:

Invalid expression term 'object'.

But you can still write this:

var name = nameof(System.Object);

Why nameof(object) does not compile?

Answer 1

The difference is that object is a synonym for the class Object and nameof() doesn't work on synonyms.

Same applies to nameof(int) vs nameof(Int32)