Skip to content
  • Home Home Home, current page.
  • Moments Moments Moments, current page.

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?
    New to Twitter?
    Sign up
propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

Tweets

Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

Europe
propensive.com
Joined July 2010

Tweets

  • © 2021 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list

    Under 100 characters, optional
    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @posco @Blaisorblade and

      Is case class Foo(x: Int) extends Top legit? (I guess no). class Bar(x: Int, y: String) extends Top (I guess no again).

      1 reply 0 retweets 0 likes
    2. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @posco @Blaisorblade and

      Is class Foo(x: Int) extends Any okay? If so, does it box? Seems like complex rules between extends AnyVal, extends Any, extends Top

      2 replies 0 retweets 0 likes
    3. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @posco @Blaisorblade and

      I didn’t see any of this answered. Opaque type is much more contained and lacking most of these consistency questions.

      2 replies 0 retweets 2 likes
    4. Jon Pretty‏ @propensive 23 Sep 2017
      Replying to @posco @Blaisorblade and

      The SIP still doesn't explain what happens here: (x: Unsigned) match { case y: Int => ... } I wouldn't say it "lacks consistency questions".

      3 replies 0 retweets 0 likes
    5. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @propensive @Blaisorblade and

      I thought it did. I thought opaque said that is a compiler error?

      2 replies 0 retweets 0 likes
    6. Jon Pretty‏ @propensive 23 Sep 2017
      Replying to @posco @Blaisorblade and

      Though what about, (x: Any) match { case y: Unsigned => ... } You can do it for `Int` so why not an opaque "Int"?

      2 replies 0 retweets 0 likes
    7. Paolo G. Giarrusso‏ @Blaisorblade 23 Sep 2017
      Replying to @propensive @posco and

      You can't match against abstract types, and opaque types should have similar semantics (because they're semantically the same, duh).

      1 reply 0 retweets 1 like
    8. Paolo G. Giarrusso‏ @Blaisorblade 23 Sep 2017
      Replying to @Blaisorblade @propensive and

      This seems a piece of evidence that opaque types might seem easy (short) but aren't simple. Good answers exist.

      1 reply 0 retweets 1 like
    9. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @Blaisorblade @propensive and

      Honestly, scala already has Any, AnyRef and AnyVal. Adding Top to the mix seems like too much.

      2 replies 0 retweets 3 likes
    10. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @posco @Blaisorblade and

      opaque type seems tractable and doesn’t relitigate previous design choices now reified in millions of lines of code.

      1 reply 0 retweets 1 like
      Jon Pretty‏ @propensive 23 Sep 2017
      Replying to @posco @Blaisorblade and

      I think they probably are tractable, but we just need to be careful.

      11:11 PM - 23 Sep 2017
      4 replies 0 retweets 0 likes
        1. Josh Suereth‏ @jsuereth 24 Sep 2017
          Replying to @propensive @posco and

          I think the reality is trying to avoid making similar mistakes as AnyVal. There's a reason there's a new proposal.

          0 replies 0 retweets 3 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo
        2. New conversation
        1. Josh Suereth‏ @jsuereth 24 Sep 2017
          Replying to @propensive @posco and

          Also, I think the main objection is companion objects on types, and inconsistencies there.

          2 replies 0 retweets 0 likes
        2. P. Oscar Boykin‏ @posco 24 Sep 2017
          Replying to @jsuereth @propensive and

          I'll be watching for consistency between `class Foo(x: Int) extends T` where T in AnyVal, Any, Top. When each of those box sounds complex.

          1 reply 0 retweets 0 likes
        3. Show replies
        3. New conversation
        1. Josh Suereth‏ @jsuereth 24 Sep 2017
          Replying to @propensive @posco and

          As for pattern Matching an Any... With any erased type you give up runtime reflection without using a reified tag. That seems consistent..

          1 reply 0 retweets 0 likes
        2. Paolo G. Giarrusso‏ @Blaisorblade 24 Sep 2017
          Replying to @jsuereth @propensive and

          Those are type params, here we have non-realtime types.

          1 reply 0 retweets 0 likes
        3. Show replies
        1. Josh Suereth‏ @jsuereth 24 Sep 2017
          Replying to @propensive @posco and

          But, it'd be nice to get something which fixes the AnyVal situation in sooner. Top level types are quite thorny... Remembering 2.10..

          0 replies 0 retweets 0 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2021 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info