Namespace types cannot be mixed
-----
<?php
namespace A;
echo 1;
namespace B {
    echo 2;
}
echo 3;
-----
Cannot mix bracketed namespace declarations with unbracketed namespace declarations on line 4
array(
    0: Stmt_Namespace(
        name: Name(
            parts: array(
                0: A
            )
        )
        stmts: array(
            0: Stmt_Echo(
                exprs: array(
                    0: Scalar_LNumber(
                        value: 1
                    )
                )
            )
        )
    )
    1: Stmt_Namespace(
        name: Name(
            parts: array(
                0: B
            )
        )
        stmts: array(
            0: Stmt_Echo(
                exprs: array(
                    0: Scalar_LNumber(
                        value: 2
                    )
                )
            )
        )
    )
    2: Stmt_Echo(
        exprs: array(
            0: Scalar_LNumber(
                value: 3
            )
        )
    )
)
-----
<?php
namespace A {
    echo 1;
}
echo 2;
namespace B;
echo 3;
-----
Cannot mix bracketed namespace declarations with unbracketed namespace declarations on line 6
array(
    0: Stmt_Namespace(
        name: Name(
            parts: array(
                0: A
            )
        )
        stmts: array(
            0: Stmt_Echo(
                exprs: array(
                    0: Scalar_LNumber(
                        value: 1
                    )
                )
            )
        )
    )
    1: Stmt_Echo(
        exprs: array(
            0: Scalar_LNumber(
                value: 2
            )
        )
    )
    2: Stmt_Namespace(
        name: Name(
            parts: array(
                0: B
            )
        )
        stmts: array(
            0: Stmt_Echo(
                exprs: array(
                    0: Scalar_LNumber(
                        value: 3
                    )
                )
            )
        )
    )
)