Why statements cannot appear at namespace scope?

Question

Any idea on which rule in standard states the statements like this:

p++; //where \'p\' is pointer to array

cannot appear in global scope? <

Answer 1

By saying "statements like this" I guess you know that/why statements in general cannot be in global scope.

p++;

Is a statement because it basically is translated into:

p = p + 1;

Which is a normal statement.