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oacgnol's profile
toon long
toon long
toon long
@oacgnol

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toon long

@oacgnol

scala gardener @stripe, sweat(shirt/pants) connoisseur. he/him

austin, formerly brooklyn
Joined September 2010

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    1. P. Oscar Boykin‏ @posco 1 May 2019
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      I had the pleasure of dinner once with @graydon_pub who said something I found intriguing: many languages are pushing too much work into the type-system vs other mechanisms... I didn't have good intuition for what he meant at the time.

      2 replies 0 retweets 16 likes
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    2. P. Oscar Boykin‏ @posco 1 May 2019
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      working on Bosatsu: https://github.com/johnynek/bosatsu … a total language (no infinite loops, no crashes) I think I have an idea what he meant, e.g. you can make pattern match totality checking independent of the type-system.

      3 replies 0 retweets 10 likes
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    3. P. Oscar Boykin‏ @posco 1 May 2019
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      Bosatsu supports limited structural recursion (recursion that MUST operate on a strictly smaller and lower bounded input), this can be checked without full type-checking.

      1 reply 0 retweets 3 likes
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    4. P. Oscar Boykin‏ @posco 1 May 2019
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      Finally, I'm interested in adding functions that may only be called at compile time (never runtime), where we could allow crashing since that would be a compile error. Again, I think this check can be done with syntactic and naming rules.

      3 replies 0 retweets 4 likes
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    5. P. Oscar Boykin‏ @posco 1 May 2019
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      One could imagine instead pushing some of this logic into the type system and proving the theorems there. In some cases it may be nice indeed, but there are other tools in our toolbox. Of course... maybe this isn't what @graydon_pub meant, but that was my interpretation.

      1 reply 0 retweets 8 likes
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      toon long‏ @oacgnol 1 May 2019
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      Replying to @posco @graydon_pub

      i’m sure this is a trivial answer but if not in the type system, then what entity would be enforcing these checks? the compiler still, or some other external tooling?

      6:26 PM - 1 May 2019
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        2. P. Oscar Boykin‏ @posco 1 May 2019
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          Replying to @oacgnol @graydon_pub

          Still the compiler, but you can prove theorems directly without them being stated in your type system.

          2 replies 0 retweets 3 likes
        3. Flavius Braziliens‏ @flaviusbraz 1 May 2019
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          Replying to @posco @oacgnol @graydon_pub

          Type systems can be seen as prototype languages executed at compile time (like macros). These languages are normally limited, which makes "type" code very different from "value" code

          1 reply 0 retweets 3 likes
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