Interface
-----
<?php

interface A extends C, D {
    public function a();
}
-----
array(
    0: Stmt_Interface(
        name: A
        extends: array(
            0: Name(
                parts: array(
                    0: C
                )
            )
            1: Name(
                parts: array(
                    0: D
                )
            )
        )
        stmts: array(
            0: Stmt_ClassMethod(
                type: 1
                byRef: false
                name: a
                params: array(
                )
                returnType: null
                stmts: null
            )
        )
    )
)