<html><head></head><body>I'm only aware of the monadic apprach here: <a href="https://github.com/agda/agda-system-io/">https://github.com/agda/agda-system-io/</a><br><br>Perhaps, Anton has something in his work on GUIs?<br><br><div class="gmail_quote">On February 27, 2019 12:27:46 PM CET, Thorsten Altenkirch <Thorsten.Altenkirch@nottingham.ac.uk> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail">I know this paper. Is there a coinductive implementation of IO which I can use from interactive agda? If yes where is it described?<br><br>Thorsten<br><br>On 27/02/2019, 11:03, "Agda on behalf of Henning Basold" <agda-bounces@lists.chalmers.se on behalf of henning@basold.eu> wrote:<br><br> -----BEGIN PGP SIGNED MESSAGE-----<br> Hash: SHA512<br> <br> What Guillaume refers to is the paper "Interactive Programs and Weakly<br> Final Coalgebras in Dependent Type Theory", I suppose. However, this<br> will not give you any printing methods, you still need to implement<br> them yourself as commands that you evaluate later in the compilation<br> stage. Also, since IO is implemented as cofree comonad, evaluation of<br> elements in it will typically not terminate. Thus, in the end you will<br> have to resort to some mechanism that cuts of evaluation again.<br> <br> That being said, maybe it's worthwhile to implement IO in the standard<br> library and have a general abortion mechanism in the evaluation of<br> compiled programs.<br> <br> Henning<br> <br> On 27/02/2019 11:25, Thorsten Altenkirch wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;">Can I use IO from interactive agda? How? What do you mean it is<br>defined coinductively? Where is this described?<br><br>On 26/02/2019, 16:35, "Guillaume Allais"<br><guillaume.allais@ens-lyon.org> wrote:<br><br>IO is coinductive so you could write `Stream String -> IO ()` in<br>Agda itself.<br><br>On 26/02/2019 17:08, Thorsten Altenkirch wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #ad7fa8; padding-left: 1ex;">I told them that I have no idea how to run the compiler. Which is<br>true. T.<br><br>From: "Setzer A.G." <a.g.setzer@swansea.ac.uk> Date: Tuesday, 26<br>February 2019 at 15:59 To: Thorsten Altenkirch<br><psztxa@exmail.nottingham.ac.uk>, agda list<br><agda@lists.chalmers.se> Subject: Re: printing infinite<br>structures<br><br>The only disadvantage is that you need to compile your code, but<br>I when interacting with students the first thing they want to<br>know is how to compile the code.<br><br><br><br><br><br>This message and any attachment are intended solely for the<br>addressee and may contain confidential information. If you have<br>received this message in error, please contact the sender and<br>delete the email and attachment.<br><br>Any views or opinions expressed by the author of this email do<br>not necessarily reflect the views of the University of<br>Nottingham. 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