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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    Tim Sweeney‏ @TimSweeneyEpic 1 Mar 2019
    • Report Tweet
    • Report NetzDG Violation

    For LISP and s-expression advocates: How do compilers and macro systems actually deal with error reporting and debugging? Doesn't propagating line numbers and annotations break all the nice properties of s-expressions?

    2:51 PM - 1 Mar 2019
    • 8 Retweets
    • 41 Likes
    • Virtual Black E13ctricShXck{27} Ufuk Kenan Taflan justin pav James Koss GAURAV 🐍 Sergei joseph mcguire Matej Fandl
    9 replies 8 retweets 41 likes
      1. New conversation
      2. Paul Khuong‏ @pkhuong 1 Mar 2019
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        Replying to @TimSweeneyEpic

        We work in terms of forms. n'th form in the file, m'th subform, etc.

        1 reply 0 retweets 7 likes
      3. Paul Khuong‏ @pkhuong 1 Mar 2019
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        Replying to @pkhuong @TimSweeneyEpic

        The editor can map that back graphically or to line/column. As a backup, we can also add annotate syntax object at read time.

        1 reply 0 retweets 5 likes
      4. 1 more reply
      1. New conversation
      2. Per Vognsen‏ @pervognsen 1 Mar 2019
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        Replying to @TimSweeneyEpic

        All of the work on Scheme hygienic macros have been about avoiding this issue. They use syntax objects, not S-expressions. There's a lossy translation between them, but it doesn't lose you all the nice properties at all, no.

        2 replies 0 retweets 7 likes
      3. Per Vognsen‏ @pervognsen 1 Mar 2019
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        Replying to @pervognsen @TimSweeneyEpic

        It's worth looking at Racket's approach to this problem. They have the most extensive support for this of any modern Lisp-family language.

        0 replies 0 retweets 4 likes
      4. End of conversation
      1. Rainer Joswig‏ @RainerJoswig 2 Mar 2019
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        Replying to @TimSweeneyEpic

        In typical Lisp, s-expressions have no line-numbers and no annotations. In individual implementations DEFUN, DEFMACRO, ... may record source locations, source forms, ... But there usually isn't a general mechanism in the language. R6RS Scheme and related has syntax objects.

        0 replies 1 retweet 2 likes
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      1. t‏ @tttttttttttttcc 2 Mar 2019
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        Replying to @TimSweeneyEpic

        https://docs.racket-lang.org/guide/stx-obj.html …

        0 replies 0 retweets 2 likes
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      1. :3‏ @Colonthreee 1 Mar 2019
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        Replying to @TimSweeneyEpic

        I wonder, did you use a stunt double while on the HoloLens 2-presentation, a ghostwriter for your tweets, scheduled tweets, or are you just really good at multitasking? :3c

        0 replies 0 retweets 0 likes
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      1. aerique‏ @aerique 1 Mar 2019
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        Replying to @TimSweeneyEpic

        Summoning #Lisp hackers to this thread.

        0 replies 0 retweets 0 likes
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