Monthly Downloads: 4
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License

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pi-forall language

This language implementation is designed to accompany four lectures at OPLSS during Summer 2022. Notes for these lectures are included in the distribution:

  • [oplss.pdf](doc/oplss.pdf)

(The documentation [README.md](doc/README.md) includes details about how the notes are typeset.)

These lecture notes correspond to an increasingly expressive demo implementation of dependently-typed lambda calculus. Each of the following subdirectories is self-contained (and all are generated from the same source, located in the [main/](main/) directory).

  • [version1/](version1/): Basic language implementation
  • [version2/](version2/): Basic language extended with nontrivial definitional equality
  • [version3/](version3/): Above, extended with irrelevant arguments
  • [full/](full/): Full language with datatypes

The implementation [README.md](main/README.md) includes instructions about how to compile and work with these implementations.


This is a revised version of lecture notes originally presented at OPLSS during 2014 and 2013.

Videos from the 2014 lectures are also available from the OPLSS website. If you want to watch these videos, you should look at the 2014 branch of this repository.

An abridged version of these lectures was also given at the Compose Conference, January 2015. Notes from this version are also available.

  • [compose.md](old/compose.md): Overview of pi-forall implementation

-- Stephanie Weirich