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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    Patrick Walton‏ @pcwalton Feb 26
    • Report Tweet
    • Report NetzDG Violation

    Being able to add a field to a data type and having the compiler tell you everywhere you need to update the code is a huge productivity multiplier. It’s a shame when languages forego this advantage.

    1:43 PM - 26 Feb 2020
    • 19 Retweets
    • 179 Likes
    • Aayush Shah Wasim Tamschi (🏠) Huw Pritchard Markus Wolf Muhammad Mominul Huque Sasikanth Kotti Stacey Ell Brennan Saeta
    6 replies 19 retweets 179 likes
      1. New conversation
      2. Andrew Gallant‏ @burntsushi5 Feb 26
        • Report Tweet
        • Report NetzDG Violation
        Replying to @pcwalton

        One of my biggest complaints about Go. At work, we have a test helper (built with reflection) that verifies that a particular value has no "zero" values. You can then write tests will fail automatically if a new field is added and a constructor (or similar) weren't updated.

        1 reply 0 retweets 13 likes
      3. Andrew Gallant‏ @burntsushi5 Feb 26
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        Replying to @burntsushi5 @pcwalton

        But there's a lot of ceremony behind using it, so in practice, the fact that the compiler doesn't fail when a new field is added ends up pervasively influencing API design. There are upsides to it, but on balance, I'd rather do without automatic default values everywhere.

        1 reply 0 retweets 10 likes
      4. 2 more replies
      1. New conversation
      2. Esteban K –  🦀 ⚙️@home‏ @ekuber Feb 26
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        Replying to @pcwalton

        The only thing missing is leveraging rustc/rustfix for refactoring workflows. Think operations of "remove this field everywhere" driven by rustc suggestions applied by rustfix being representable and not just ad-hoc.

        2 replies 0 retweets 10 likes
      3. James<'a, N> where N: ArrayLength<u8>,‏ @bitshiftmask Feb 26
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        Replying to @ekuber @pcwalton

        I wonder if this is something that could be addressed by @rust_analyzer? I know it already has some ability to fill missing items...

        3 replies 0 retweets 8 likes
      4. 4 more replies
      1. New conversation
      2. Quil‏ @robotlolita Feb 26
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        Replying to @pcwalton

        I would love to have this but without having to actually fix those cases before i can run the program; and to be able to make changes backwards compatible since sometimes structures are used outside of the codebase that defines them PLs seem to pick one or the other; I want both

        3 replies 0 retweets 9 likes
      3. Justin Le‏ @mstk Feb 26
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        Replying to @robotlolita @pcwalton

        Haskell can get a nice version of this behavior with -fdefer-type-errors :)

        1 reply 0 retweets 3 likes
      4. 2 more replies
      1. Tony “Abolish ICE” Arcieri  🦀‏ @bascule Feb 26
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        Replying to @pcwalton

        Having just written a streaming zero-copy pull parser built on a state machine implemented as a pile of enums: so much this

        0 replies 0 retweets 13 likes
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      1. New conversation
      2. {{data.user}}‏ @phenlix Feb 26
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        Replying to @pcwalton

        Why should any code have to be changed when adding a new field ?

        2 replies 0 retweets 6 likes
      3. Paul Masurel‏ @fulmicoton Feb 27
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        Replying to @phenlix @pcwalton

        Initialization, hash, comparison, serialization, etc.

        0 replies 0 retweets 1 like
      4. End of conversation
      1. New conversation
      2. Erik Z‏ @besez Feb 26
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        Replying to @pcwalton

        Does there exist an equivalent to Java's Override annotation in rust? It's really useful when removing a function from an interface, the compiler tells you everywhere it needs to be removed.

        2 replies 0 retweets 0 likes
      3. Anthony Ramine‏ @nokusu Feb 27
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        Replying to @besez @pcwalton

        Your code won’t compile if you remove a method from a trait definition and keep some of its implementations around, so there is no need for the Override attribute.

        0 replies 0 retweets 2 likes
      4. End of conversation

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