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PossiblyUnusedProperty

Emitted when --find-dead-code is turned on and Psalm cannot find any uses of a particular public/protected property.

If this property is used and part of the public API, annotate the containing class with @psalm-api.

<?php

class A {
    /** @var string|null */
    public $foo;

    /** @var int|null */
    public $bar;
}

$a = new A();
echo $a->foo;