Unable to resolve the template type TRest in call to function Psl\Type\intersection

Hi,

Unsure if this is the best place to raise this (i suspect not) but:

```php
$offset = Type\intersection(
    Type\int(Foo::class),
    Type\instance_of(Bar::class),
)->assert($offset);
```

will error: 
`Unable to resolve the template type TRest in call to function Psl\Type\intersection`

Same happens for `Type\union`