Call for Contributions: WITS 2022

                    CALL FOR CONTRIBUTIONS

      1st Workshop on the Implementation of Type Systems

                         WITS 2022

                      January 22, 2022
                   Philadelphia, PA, USA

WITS 2022 is the first Workshop on the Implementation of Type
Systems. The workshop will be held on January 22, 2022, in
Philadelphia, PA, United States, co-located with POPL. The goal of
this workshop is to bring together the implementors of a variety of
languages with advanced type systems. The main focus is on the
practical issues that come up in the implementation of these systems,
rather than the theoretical frameworks that underlie them. In
particular, we want to encourage exchanging ideas between the
communities around specific systems that would otherwise be accessible
to only a very select group.

Given the importance of collaboration among the attendees at WITS, if
circumstances around covid-19 force POPL (and its co-located events)
to go virtual, WITS will be deferred until a time when we can come
together safely in person.

The workshop will have a mix of invited and contributed talks,
organized discussion times, and informal collaboration time.


We invite participants to share their experiences, study differences
among the implementations, and generalize lessons from those. We also
want to promote the creation of a shared vocabulary and set of best
practices for implementing type systems.

Here are a few examples of topics we are interested to discuss:

  • syntax with binders and substitution
  • conversion modulo beta and eta
  • implicit arguments and metavariables
  • unification and constraint solving
  • metaprogramming and tactic languages
  • editor integration and automation
  • discoverability of language features
  • pretty printing and error messages

This list is not exhaustive, so please contact the PC chairs in case
you are unsure if a topic falls within the scope of the workshop.


WITS solicits two kinds of submissions:

  • Contributed talks on the basis of an abstract. This can be on
    recently published or submitted work, work in progress, or even a
    project that is still in the idea phase.

  • Proposals for roundtable discussions. This can be on any topic
    within the scope of the workshop, but should have a broader scope
    than a contributed talk. If accepted, you will be in charge of
    leading a discussion of 45 minutes around the proposed topic
    together with other interested attendees.

Both kinds of proposals should be accompanied by an abstract of max. 1
page (exclusive of references), formatted according to the guidelines
for SIGPLAN conferences: use the sigplan option to the acmart
LaTeX document class. WITS will have no published proceedings, so
submitting to WITS does not interfere with submission (before, after,
or simultaneously) with other venues. Submissions are handled via

Important Dates

  • Abstract submission deadline: 16 November, 2021 (AoE)
  • Notification: 1 December, 2021 (AoE)
  • Workshop in Philadelphia: 22 January, 2022

Attendance and registration

WITS 2022 is colocated with POPL 2022 in Philadelphia, USA. More
information on registration and attendance will be announced later.

Program Committee

William J. Bowman, U. of British Columbia, Canada
Jesper Cockx, TU Delft, Netherlands (co-chair)
Leonardo de Moura, Microsoft Research, USA
Richard A. Eisenberg, Tweag, USA (co-chair)
András Kovács, Eotvos Lorand U., Hungary
Pierre-Marie Pédrot, INRIA, France
Aaron Stump, U. of Iowa, USA
Niki Vazou, IMDEA, Spain

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