Comment changes
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<?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;