Scheme In One Defun (or Scheme In One Day) is a small-footprint implementation of the Scheme programming language, written in C and designed to be embedded inside C programs. It was originally written by Professor George J. Carrette at Boston University as a demonstration in a laboratory.


  • SIOD implements the original version of Scheme from the Lambda Papers, but it does not implement any of the modern language standards.
  • SIOD represents a very early use of conservative garbage collection in a Lisp interpreter, a technique which was later copied by SCM and Guile.
  • Compilation is implemented by emitting a fixed machine code prologue followed by a fast-loading binary representation of the parse tree to be interpreted.


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