## Problem

I have some files in the "models" directory that are not true a `Class`. For example, a [`dry-types`](https://dry-rb.org/gems/dry-types/1.2/sum/) sum type:

```ruby
# app/models/foo.rb
Foo = Types::String | Types::Integer
```

This results in the following line when I annotate.

```
Unable to annotate app/models/foo.rb: undefined method `<' for #<Dry::Struct::Sum:0x00007ff2dd262988>
```

Not a blocking issue but somewhat annoying nonetheless.

## Solution

When annotating a file, check that the file's object is a `Class` to ensure it has the interface we expect.