Hygienic Macros for ACL2

  • Carl Eastlund
  • Matthias Felleisen
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6546)


ACL2 is a theorem prover for a purely functional subset of Common Lisp. It inherits Common Lisp’s unhygienic macros, which are used pervasively to eliminate repeated syntactic patterns. The lack of hygiene means that macros do not automatically protect their producers or consumers from accidental variable capture. This paper demonstrates how this lack of hygiene interferes with theorem proving. It then explains how to design and implement a hygienic macro system for ACL2. An evaluation of the ACL2 code base shows the potential impact of this hygienic macro system on existing libraries and practices.


Free Variable Theorem Prove Source Program Common Lisp Unique Symbol 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Carl Eastlund
    • 1
  • Matthias Felleisen
    • 1
  1. 1.Northeastern UniversityBostonUSA

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