anchor.diff:             :v-casts-to-p
              :v-casts-to
              :find-mutual-cast-type
  +           :name
   
              ;;type functions
              :type-specp
  
positive.code:            :used-external-functions
             :ast
             :function-asts
  
             ;;utils
             :map-environments
  
negative.code:            :uniform-origin-name
             :origin-name
  
             ;; implicit uniforms
             :add-lisp-form-as-uniform
             :cpu-side-transform
  
             ;; metadata
             :combine-metadata
  
             ;; external functions
             :external-function
             :add-external-function
             :delete-external-function
  
             ;;compiler
             :*supported-stages*
             :*supported-versions*
             :make-stage
             :compile-form
             :with-stemcell-infer-hook
             :with-constant-inject-hook
  