Dear Friends and Colleagues,

We have a great pleasure inviting you to participate in this year's edition
of the ACM SIGPLAN Workshop on Higher-Order Programming with Effects (
https://icfp18.sigplan.org/track/hope-2018-papers). The HOPE workshop
series are intended to bring together researchers interested in the design,
semantics, implementation, and verification of higher-order effectful
programs. They are *informal*, consisting of invited talks, contributed
talks on work in progress, and open-ended discussion sessions. They are
dedicated to John Reynolds, whose work is an inspiration to us all.

**Goals of the Workshop**

A recurring theme in many papers at ICFP, and in the research of many ICFP
attendees, is the interaction of higher-order programming with various
kinds of effects: storage effects, I/O, control effects, concurrency, etc.
While effects are of critical importance in many applications, they also
make code harder to build, maintain, and reason about. Higher-order
languages (both functional and object-oriented) provide a variety of
abstraction mechanisms to help “tame” or “encapsulate” effects (e.g.
monads, ADTs, ownership types, typestate, first-class events, transactions,
Hoare Type Theory, session types, substructural and region-based type
systems), and a number of different semantic models and verification
technologies have been developed in order to codify and exploit the
benefits of this encapsulation (e.g. bisimulations, step-indexed Kripke
logical relations, higher-order separation logic, game semantics, various
modal logics). But there remain many open problems, and the field is highly
active.

The goal of the HOPE workshop is to bring researchers from a variety of
different backgrounds and perspectives together to exchange new and
exciting ideas concerning the design, semantics, implementation, and
verification of higher-order effectful programs.

We want HOPE to be as informal and interactive as possible. The program
will thus involve a combination of invited talks, contributed talks about
work in progress, and open-ended discussion sessions. There will be no
published proceedings, but participants will be invited to submit working
documents, talk slides, etc., to be made available online.

**Call for Presentations**

We solicit proposals for contributed talks. We recommend preparing
proposals of at most 2 pages, in either plain text or PDF format. However,
we will accept longer proposals or submissions to other conferences, under
the understanding that PC members are only expected to read the first two
pages of such longer submissions. When submitting talk proposals, authors
should specify how long a talk the speaker wishes to give. By default,
contributed talks will be 30 minutes long, but proposals for shorter or
longer talks will also be considered. Speakers may also submit
supplementary material (e.g., a full paper, talk slides) if they desire,
which PC members are free (but not expected) to read.

We are interested in talks on all topics related to the interaction of
higher-order programming and computational effects. Talks about work in
progress are particularly encouraged. If you have any questions about the
relevance of a particular topic, please contact the PC chairs, Filip
Sieczkowski (efes@cs.uni.wroc.pl) and François Pottier (
francois.pottier@inria.fr).

**Important Dates**

* Deadline for talk proposals: June 8th, 2018 (Friday)
* Notification of acceptance:  July 8th, 2018 (Sunday)
* Workshop:  September 23, 2018 (Sunday)

— Best regards,

Filip Sieczkowski and François Pottier, PC co-chairs

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