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edwinbrady's profile
Edwin Brady
Edwin Brady
Edwin Brady
@edwinbrady

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Edwin Brady

@edwinbrady

CompSci Lecturer. Go player. Programming language researcher. Idris hacker. Denies knowledge of Whitespace. He/him. http://tinyurl.com/TypeDD 

St Andrews
eb.host.cs.st-andrews.ac.uk
Joined November 2008

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    1. Gary Burgess‏ @gb_r 4 Feb 2018
      • Report Tweet
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      Replying to @gb_r @edwinbrady @marick

      For what it's worth, I don't think a fully magic `Show` is a bad idea, since it should only be used for debugging etc. IMO anyway. We just haven't figured out the details of how we'd want to do it given you can private constructors and all sorts of things like that.

      1 reply 0 retweets 0 likes
    2. Brian Marick‏ @marick 4 Feb 2018
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      Replying to @gb_r @edwinbrady

      Does this really have to do with `Show`? It seems to me that its about the creation of the value, not its stringification?

      1 reply 0 retweets 0 likes
    3. Edwin Brady‏ @edwinbrady 4 Feb 2018
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      Replying to @marick @gb_r

      It's nothing to do with Show in Idris, at least, since it displays a representation of the normal form. While procrastinating this morning, I made a tiny tweak to Idris: Idris> Nothing Nothing : Maybe a Idris> [] [] : List elem

      1 reply 0 retweets 2 likes
    4. Edwin Brady‏ @edwinbrady 4 Feb 2018
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      Replying to @edwinbrady @marick @gb_r

      But it's not clear exactly when this is desirable, since sometimes a hole might indicate a real error (rather than, as in this case, a generic type that can't been resolved yet). This has come up a few times, will think about it more deeply for version 2...

      1 reply 0 retweets 2 likes
    5. Brian Marick‏ @marick 4 Feb 2018
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      Replying to @edwinbrady @gb_r

      My guess is it doesn't come up much in non-repl practice. A non-jargony error message would help Elm newbies. I spent a bit over an A4 page explaining the issue to them. (First draft.)pic.twitter.com/ETLOeNYpZl

      2 replies 0 retweets 1 like
    6. Edwin Brady‏ @edwinbrady 5 Feb 2018
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      Replying to @marick @gb_r

      Hmm, yes, maybe it is better to come up with a good error message (if it's possible to tell when that's the error, at least) than to hack around it - it is a REPL only problem in Idris. Your explanation makes sense for Idris, at least.

      1 reply 0 retweets 0 likes
    7. Brian Marick‏ @marick 5 Feb 2018
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      Replying to @edwinbrady @gb_r

      Data point. Having been doing repl work all day, this old Lisp hacker and new Elm-ist keeps getting frustrated by things like the attached.pic.twitter.com/RML2HYOUtr

      2 replies 0 retweets 0 likes
    8. Brian Marick‏ @marick 5 Feb 2018
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      Replying to @marick @edwinbrady @gb_r

      When I was doing Clojure work, I had a reputation for using the repl less than others. (Because I'm a TDD person.) But using the repl to tinker around and find out what functions really do was part of my practice. It translated well to Elm, having more trouble with PureScript.

      1 reply 0 retweets 0 likes
    9. Brian Marick‏ @marick 5 Feb 2018
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      Replying to @marick @edwinbrady @gb_r

      On the other hand, when I remember to use `:type`, I actually do get pretty much the same experience by using it as I build up expressions like: String.reverse <$> tail <$> (String.uncons =<< String.reverse <$> head ["Dawn"]) Is that how people use the repl?

      2 replies 0 retweets 0 likes
    10. Edwin Brady‏ @edwinbrady 5 Feb 2018
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      Replying to @marick @gb_r

      I prefer using holes in source files these days to tinkering at the REPL - but I also agree (I think this is what you're saying...) that requiring Show at the REPL is an annoying limitation.

      3 replies 0 retweets 2 likes
      Edwin Brady‏ @edwinbrady 5 Feb 2018
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      Replying to @edwinbrady @marick @gb_r

      Also, maybe this is a relevant distinction: at the REPL Haskell (and probably others) compiles and executes expressions, whereas Idris evaluates them. Which probably leads to different choices being made about how to display results.

      3:50 PM - 5 Feb 2018
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      • harry 🏳️‍🌈 Gary Burgess
      0 replies 0 retweets 2 likes

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