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diff --git a/users/wpcarro/lisp/prelude.lisp b/users/wpcarro/lisp/prelude.lisp
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+(in-package #:cl-user)
+(defpackage #:prelude
+  (:documentation "Supporting miscellaneous utility functions and macros.")
+  (:use #:cl)
+  (:shadow #:type)
+  (:export #:type #:comment))
+(in-package #:prelude)
+
+;; TODO: Add documentation to these macros.
+
+(defmacro type (name in out)
+  `(declaim (ftype (function ,in ,out) ,name)))
+
+(defmacro comment (&rest _forms) nil)