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UNSLISP
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R7RS compiler written in a basic form of Scheme. Compiles to Universal
Service GLLV bytecode.

License: GPL-3.0-only

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Source Restrictions
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Although the compiler handles all of R7RS, the source of UNSLISP is
designed to be used by a severely limited Scheme interpreter, which

* lacks ``call/cc``, ``call-with-values``, etc
* lacks user definable macros
* only uses required features from R3RS
  (except ``open-input-port``, ``close-input-port``, ``read-char``,
   ``open-output-port``, ``close-output-port``, ``write-char``)
* has fixnums only
* only uses immutable strings
* does not use "load" recursively

The goal is to have the compiler run under MiniScheme in DOS.