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psalm/docs/running_psalm/issues/InternalProperty.md

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# InternalProperty
Emitted when attempting to access a property marked as internal from an unrelated namespace or class, or attempting
to access a property marked as psalm-internal to a different namespace.
```php
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<?php
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namespace A {
class Foo {
/**
* @internal
* @var ?int
*/
public $foo;
}
}
namespace B {
class Bat {
public function batBat() : void {
echo (new \A\Foo)->foo;
}
}
}
```