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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    1. Box::new(christian)‏ @z1mvader Jan 22
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      Ok let's try again. We've been working in integrating an small symbolic execution into rustc with @oli_obk. Yesterday we got the compiler to accept the following program: https://play.integer32.com/?version=stable&mode=debug&edition=2018&gist=0428ea00b6d256b70371bcfa06b1783a …

      3 replies 12 retweets 46 likes
    2. yosh‏ @yoshuawuyts Jan 23
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      Replying to @z1mvader @oli_obk

      Woahhh. Almost feels like I'm looking at dependent types or something. Very cool!

      1 reply 0 retweets 4 likes
    3. yosh‏ @yoshuawuyts Jan 23
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      Replying to @yoshuawuyts @z1mvader @oli_obk

      Actually; what *is* the difference between this and dependent types? If this would extend to arbitrary types, const expressions, then what's the difference even? :O

      2 replies 0 retweets 0 likes
    4. Louis‏ @louispilfold Jan 23
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      Replying to @yoshuawuyts @z1mvader @oli_obk

      This is a limited form of dependant typing

      1 reply 0 retweets 1 like
      yosh‏ @yoshuawuyts Jan 23
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      Replying to @louispilfold @z1mvader @oli_obk

      *nods* yeah I've heard that before. But what I'm wondering where the actual limit lies. I'm... not sure now. I guess we don't have any functions that actually operate on types, but are only able to operate on types *inside* the function parameters? At least for now.

      4:28 AM - 23 Jan 2020
      4 replies 0 retweets 0 likes
        1. Box::new(christian)‏ @z1mvader Jan 23
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          Replying to @yoshuawuyts @louispilfold @oli_obk

          The craziest think that comes to mind is trying to simulate refinement types with this: struct BoolKind<const B: bool>; trait Valid {} impl Valid for BoolKind<true> {} fn first<T, const N: usize>(arr: [T; N]) -> T where BoolKind<{N > 0}>: Valid { arr[0] }

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        2. Louis‏ @louispilfold Jan 23
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          Replying to @yoshuawuyts @z1mvader @oli_obk

          I think it's quite limited. We're a long way from being able to express things like fn(x: bool) -> if x { usize } else { isize }

          1 reply 0 retweets 2 likes
        3. Louis‏ @louispilfold Jan 23
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          Replying to @louispilfold @yoshuawuyts and

          In Idris we can write that like this: stringOrInt : Bool -> Type stringOrInt True = Int stringOrInt False = String getStringOrInt : (x : Bool) -> stringOrInt x getStringOrInt x = case x of True => 94 False => "Ninety four"

          2 replies 0 retweets 2 likes
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        2. Zizz Vonnegut‏ @zizzivon Jan 23
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          Replying to @yoshuawuyts @louispilfold and

          Most of the things people want from dependent types (ie, theorems!) basically come down to what hinting/proving & solving systems are available, and which parts of the language are available in types! Since rust has (untyped) effects, there's a limit on what can go into a type.

          2 replies 0 retweets 2 likes
        3. Zizz Vonnegut‏ @zizzivon Jan 23
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          Replying to @zizzivon @yoshuawuyts and

          Systems like agda/idris/coq/isabelle have a very messy distinction between "representation/storage types" (eg, `i32`) and "proof types" (eg `x >= 3`). I think adding verification support with things lik invariants & refinement types is a better goal than dependent types.

          1 reply 0 retweets 2 likes
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        1. electrified filth‏ @sadisticsystems Jan 23
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          Replying to @yoshuawuyts @louispilfold and

          The kinds of pre and postconditions expressible are far more limited with this. You can write all kinds of programs using the rust type system but it would not be a fun experience. Dependent types make many constraints that you have to use asserts for enforcible at compile time.

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