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-@node define-type
-@section Yet Another Object System
-
-@defmac define-type (name type-parameters ...) fields ...
-Introduce a new type.
-
-Each field is either a symbol, or a list where the first element is a
-symbol, and the remaining elements are alternating keywords and
-values, as per @ref{Field Parameters}. All fields are optional by
-default, but can be made non-optional through its type parameter.
-
-The example below creates a new type called @var{type}, with a custom
-printer which always displays the string ``TYPE''. It has two fields,
-@var{x}, which must be an integer, and @var{y}, which can have any
-type, but gets the value ``Hello'' in none is given.
-@example
-(define-type (type #:printer (lambda (r p) (display "TYPE" p)))
-  (x #:type integer?)
-  (y #:default "Hello"))
-@end example
-@end defmac
-
-@subsection Type Parameters
-
-@deffn {Type Parameter} constructor (λ (primitive-constructor type-validator))
-Use a custom constructor for the type. The given procedure is called
-with two values:
-@itemize
-@item the types primitive (and usually hidden) constructor,
-which takes as many arguments as there are fields, in the order given
-in define-type, and
-@item the type validator procedure, which also takes all arguments,
-but instead either returns an undefined value if everything is fine,
-or throws @code{'wrong-type-arg} otherwise.
-@end itemize
-The procedure should then return a new procedure, which will be bound
-as the constructor for the type. Note that default values are current
-disregarded with custom constructors.
-
-A custom constructor for the type above might look like
-@example
-(lambda (primitive-constructor type-check)
-  (lambda* (#:key x y)
-    (type-check x y)
-    (primitive-constructor x y)))
-@end example
-@end deffn
-
-@deffn {Type Parameter} printer (λ (record port))
-Use a custom printer for the type.
-@end deffn
-
-@subsection Field Parameters
-@anchor{Field Parameters}
-
-@deffn {Field Parameter} default value
-Value the field should get if not given.
-@end deffn
-
-@deffn {Field Parameter} type type-clause
-A type predicate that the field must obey. See @ref{type-clause} for details.
-@end deffn
-
-@subsection Introduced Bindings
-
-Define type introduces a number procedures. (@var{<name>} should be
-replaced with whatever was given as @var{name} to define-type.
-
-@defun @var{<name>} [kv-args ...]
-Type constructor. Takes key-value arguments. Where the keys are the
-names of the fields.
-@end defun
-
-@defun @var{<name>}? x
-Type predicate.
-@end defun
-
-And for each field @var{<field>}:
-
-@defun @var{<field>} object [value]
-Accessor for the given filed.
-Returns the current value if called with only an object, and returns a
-new object with @var{field} set to @var{value} if called with two values.
-
-The updating version checks the type if #:type was given on creation.
-@end defun