Incorrect behavior of ReturnTypeFromStrictScalarReturnExprRector

[mvhirsch]

Bug Report

I love ❤️ rector. It saves me from heart attacks while refactoring code!

Subject	Details
Rector version	v0.17
Installed as	composer dependency

Minimal PHP Code Causing Issue

See https://getrector.com/demo/b04a9224-2e56-4de9-b568-fff214079a16

<?php

final class DemoFile
{
    private function isConnected()
    {
        return is_array(ftp_nlist($this->connection, '.'));
    }
}

Responsible rules

• ReturnTypeFromStrictScalarReturnExprRector

Expected Behavior

Usually is_array returns a boolean. I expected something like this:

private function isConnected(): bool
{
// ...

[mvhirsch]

/cc @rewebcan