Comment changes
-----
<?php
// Test
foo();
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$stmts[0]->setAttribute('comments', []);
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<?php
foo();
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<?php
$foo;


/* bar */
$baz;
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$comments = $stmts[1]->getComments();
$comments[] = new Comment("// foo");
$stmts[1]->setAttribute('comments', $comments);
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<?php
$foo;


/* bar */
// foo
$baz;
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<?php
class Test {
    /**
     * @expectedException \FooException
     */
    public function test() {
        // some code
    }
}
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$method = $stmts[0]->stmts[0];
$method->setAttribute('comments', [new Comment\Doc("/**\n *\n */")]);
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<?php
class Test {
    /**
     *
     */
    public function test() {
        // some code
    }
}