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# SRFI-259 for CHICKEN
This is an implementation of SRFI-259 for CHICKEN.
Notable features:
* Different than `extend-procedure`, because `extend-procedure` is
stateful.
* Uses an efficient set type (integer maps) to store tags.
This is the first time I've written low-level CHICKEN code: use at your own
risk.
## Usage
Import `(srfi 259)` for only the standard bindings. Import
`(srfi 259 extensions)` for the SRFI-259 macro and the extensions
described below.
## Extensions
This library implements lambdas with object scope.
(lambda/this this formal body ...)
Create a procedure such that `this` will be bound to the current
procedure. When a new procedure is created using a tag constructor,
`this` will point to the new procedure, not to the old procedure. This
allows for a procedure to inspect its own tags.
(procedure/this? obj)
Returns true if `obj` is a procedure created using `lambda/this`.
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