* documentation:
  * Message
  * Pattern
  * String
  * File
  * Directory
  * Method
  * Char
  * Expression
    * @(`Match new: List on: Expression)
    * @(`Block new: List) and `(@Block new: List arguments: List)
    * @(`List new: List)
    * @(String parse-expressions) -- rename?
    * @(evaluate: Expression)
    * expression meta-stuff

  * @(Block: List) and @(Block: List arguments: List)

  * @(Object repl)
  * @(Object basic-repl)

  * @when:
  * @unless:do:
  * @unless:

  * @define:on:with:as:
  * @define:on:as:

  * @match:on:

  * @from:take:

  * @interaction:

  * @indent:
  * @word-wrap:

  * @describe-error

  * @(- Number)