--- /dev/null
+Nested namespaces are not allowed
+-----
+<?php
+namespace A {
+ namespace B {
+
+ }
+}
+-----
+Namespace declarations cannot be nested from 3:5 to 5:5
+array(
+ 0: Stmt_Namespace(
+ name: Name(
+ parts: array(
+ 0: A
+ )
+ )
+ stmts: array(
+ 0: Stmt_Namespace(
+ name: Name(
+ parts: array(
+ 0: B
+ )
+ )
+ stmts: array(
+ )
+ )
+ )
+ )
+)
\ No newline at end of file