1Nested namespaces are not allowed
2-----
3<?php
4namespace A {
5    namespace B {
6
7    }
8}
9-----
10Namespace declarations cannot be nested from 3:5 to 5:5
11array(
12    0: Stmt_Namespace(
13        name: Name(
14            name: A
15        )
16        stmts: array(
17            0: Stmt_Namespace(
18                name: Name(
19                    name: B
20                )
21                stmts: array(
22                )
23            )
24        )
25    )
26)
27