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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. A Conor‏ @pigworker 12 Aug 2018
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      The other thing we give up, I suppose, is pretending. We can’t get away with treating nontermination effects as if they weren’t there. Hence eval : Term -> Delay Value which we can write for any Turing-complete Term. Business only as usual, made explicit.

      1 reply 2 retweets 10 likes
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    2. A Conor‏ @pigworker 12 Aug 2018
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      When we put that "Delay" in the type, or write a fuel-driven approximant, we're often accused of somehow cheating, but we're only telling the truth: we can't show this is finite but we can run it as long as you want. That's the *only* deal for partial languages.

      1 reply 2 retweets 17 likes
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    3. A Conor‏ @pigworker 12 Aug 2018
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      Hilariously, we're also accused of "giving something up" by not allowing arbitrary symbolic execution of infinitary programs at *compile* time. The truth is that we can safely do a hell of a lot more compile time execution of programs than in partial languages.

      2 replies 1 retweet 15 likes
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    4. A Conor‏ @pigworker 12 Aug 2018
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      That's to say, yes, we're giving something up, compared to GOD. We're giving nothing up, compared to YOU.

      1 reply 4 retweets 21 likes
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    5. A Conor‏ @pigworker 12 Aug 2018
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      Many people start out correctly pointing out that total languages are subject, as are partial languages, to fundamental limitations on computability. Yes. They then invent and disseminate negative consequences which are total fiction.

      2 replies 2 retweets 4 likes
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    6. A Conor‏ @pigworker 12 Aug 2018
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      And yes, we're all schmucks in the face of the future. I'd like to enforce "done in three microseconds", not just "done eventually". We're only at the beginning of the honesty journey.

      4 replies 8 retweets 29 likes
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    7. A Conor‏ @pigworker 13 Aug 2018
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      There are legitimate concerns about the pragmatics of totality. Inevitably, to get more promises out, you have to put more evidence in. Today's overly syntactic termination oracles leave a lot of room for improvement. But talk of programs we "can't write" is bunk.

      1 reply 5 retweets 23 likes
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    8. Tran Ma (≧△≦)‏ @trannosaurusma 13 Aug 2018
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      Replying to @pigworker

      pic.twitter.com/BXb2oXINfw

      3 replies 3 retweets 14 likes
    9. Tran Ma (≧△≦)‏ @trannosaurusma 13 Aug 2018
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      Replying to @trannosaurusma @pigworker

      It’s like...they thought there can be no reduction on coinductive terms?

      1 reply 0 retweets 3 likes
    10. A Conor‏ @pigworker 13 Aug 2018
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      Replying to @trannosaurusma

      It probably never occurred to them to ask.

      1 reply 0 retweets 0 likes
      Edwin Brady‏ @edwinbrady 13 Aug 2018
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      Replying to @pigworker @trannosaurusma

      Maybe they ran out of fuel at just the wrong time

      4:06 PM - 13 Aug 2018
      • 8 Likes
      • Ashley Woodard Lars Hupel Vanessa McHale Tran Ma (≧△≦) Eric Walkingshaw серафими многоꙮчитїи joomy Liam O'Connor
      1 reply 0 retweets 8 likes
        1. A Conor‏ @pigworker 13 Aug 2018
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          Replying to @edwinbrady @trannosaurusma

          Ah, but defaulting to a bogus output is even worse!

          0 replies 0 retweets 2 likes
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