```common lisp
(cl:in-package #:sicl-extrinsic-hir-compiler)

(defclass environment (sicl-simple-environment:simple-environment)
  ())
```

Make the extrinsic environment a superclass.
user
```common lisp
(cl:in-package #:sicl-extrinsic-hir-compiler)

(defclass environment (sicl-extrinsic-environment:environment)
  ())
```
assistant