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psalm/docs/running_psalm/issues/ImpureMethodCall.md

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# ImpureMethodCall
Emitted when calling an impure method from a function or method marked as pure.
```php
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<?php
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class A {
public int $a = 5;
public function foo() : void {
$this->a++;
}
}
/** @psalm-pure */
function filterOdd(int $i, A $a) : ?int {
$a->foo();
if ($i % 2 === 0 || $a->a === 2) {
return $i;
}
return null;
}
```