(builtins.seq
  ;; builtins
  (builtins.def def builtins.def)
  (def lookup builtins.lookup)
  (def set! builtins.set!)
  (def scope builtins.scope)
  
  ;; macro
  (def macro builtins.macro)
  (def defmacro (macro [name params body]
    (def $name (macro $params $body))))

  ;; flow
  (defmacro seq []
    (builtins.seq :null $%&))
  (defmacro namespace [name] (def $name (scope $%&)))

  ;; other
  (defmacro mut! [v fn] (seq
    (set! (ast.value! $v) ($fn $v $%&)))
  )
)