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

Tweets

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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    Edwin Brady‏ @edwinbrady May 25
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    To answer a question people sometimes ask: https://www.type-driven.org.uk/edwinb/why-is-idris-2-so-much-faster-than-idris-1.html … In which I explain several bad design decisions I made several years ago...

    11:56 AM - 25 May 2020
    • 50 Retweets
    • 151 Likes
    • Evgenii Akentev João Veiga Renzo Ohad Kammar Tycho Miles Sabin 𝝺 Rodrigo Willrich 🏳️ Vilem might have vladimír
    6 replies 50 retweets 151 likes
      1. Edwin Brady‏ @edwinbrady May 25
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        I think the TL;DR is "don't make mistakes". How hard can it be? :)

        1 reply 0 retweets 39 likes
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      2. András Kovács‏ @andrasKovacs6 May 25
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        Replying to @edwinbrady

        FYI, @ollfredo has come up with a much simpler version of smalltt's evaluator, which I've microbenchmarked to be roughly as fast. Minimal demo: https://gist.github.com/AndrasKovacs/a0e0938113b193d6b9c1c0620d853784 … It also allows some super slick approximate conversion/scope checking which was not possible before.

        3 replies 3 retweets 17 likes
      3. Edwin Brady‏ @edwinbrady May 25
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        Replying to @andrasKovacs6 @ollfredo

        Interesting, I'll take a closer look, thanks! I don't have a particularly clever evaluator yet, and I think there's going to be some things that suffer as a result.

        2 replies 0 retweets 1 like
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      2. BoydStephenSmithJr.‏ @DaTwinkDaddy May 25
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        Replying to @edwinbrady

        "This is usable directly by elaborator reflection [...]. Idris 2 takes a much simpler approach, elaborating syntax directly into the core representation." Does this mean we don't have elaboration reflection for meta-programming in Idris2, yet?

        1 reply 0 retweets 2 likes
      3. Edwin Brady‏ @edwinbrady May 25
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        Replying to @DaTwinkDaddy

        Not yet but there'll be something, in some form. I want to think about it a bit more first.

        0 replies 0 retweets 3 likes
      4. End of conversation
      1. Ross McKinlay‏ @pezi_pink May 26
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        Replying to @edwinbrady

        shunned, laughed at and despised, global mutable state is already ready to jump in and save the day :)

        0 replies 0 retweets 2 likes
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      1. SH∀∃ ∃RISSON  ☠‏ @shapr May 27
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        Replying to @edwinbrady

        I prefer bad decisions that lived long enough to be communicated to others. I've seen some lessons learned over and over or passed by word of mouth because they weren't publishable.

        0 replies 0 retweets 0 likes
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      1. Ben Lovell‏ @socksy May 27
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        Replying to @edwinbrady

        If you'd like to waste time and potentially slow down your runtime, you could implement the global context as a relaxed radix balanced tree (https://infoscience.epfl.ch/record/169879/files/RMTrees.pdf …) which can have constant time addition whilst being immutable (so I guess in theory you could have time travel?)

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