psalm/tests/fixtures/DummyProjectWithErrors/src/FileWithErrors.php

<?php
namespace Acme\SampleProject;

function foo(string $s): int
{
    return 'bar';
}

function bar(string $s) : string {
    return $s;
}

function baz(string $s) : string {
    return $s;
}

function bat(string $s) : string {
    return $s;
}

function bang(string $s) : string {
    return $s;
}

function boom(): void
{
    echo (string) ($_GET['abc'] ?? 'z');
}