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psalm/docs/running_psalm/issues/InvalidInterfaceImplementation.md
Bruce Weirdan 085e8f6fb2
Forbid implementing some interfaces 
- `Throwable` can only be implemented when classes extend one of
  `Exception` or `Error`
- `UnitEnum` and `BackedEnum` cannot be implemented by user-defined
  classes

Refs vimeo/psalm#7722
2023-02-12 02:48:50 -04:00

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InvalidInterfaceImplementation

Emitted when trying to implement interface that cannot be implemented (e.g. Throwable, UnitEnum, BackedEnum).

<?php

class E implements UnitEnum 
{
    public static function cases(): array 
    {
        return []; 
    }
}