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Developer details GHC syntax implementation journey

By PulseAugur Editorial · [1 sources] ·

A developer details their experience contributing to the Glasgow Haskell Compiler (GHC) by implementing a new syntax for instance declarations. The process, which began with a desire for a small improvement in July 2024, evolved into a more ambitious project involving significant changes to GHC's internal structure. The developer's pull request was eventually merged in April 2026, after about a year and a half of intermittent work, highlighting the complexities and learning curve involved in contributing to large-scale compiler projects. AI

RANK_REASON The item is a personal development log detailing the implementation of a new syntax feature in GHC, which falls under commentary on software development processes.

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Developer details GHC syntax implementation journey

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The item is a personal development log detailing the implementation of a new syntax feature in GHC, which falls under commentary on software development processes.
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  1. LessWrong (AI tag) TIER_1 English(EN) · philh ·

    Dev log: implementing new syntax in GHC

    <p>In September 2024, I started working on a patch to GHC.</p> <p>The story starts slightly before that. In July 2024 I wondered <a href="https://www.reddit.com/r/haskell/comments/1dy6gf3/">Could UndecidableInstances be per-instance?</a>. It seemed like a fairly small improvement…

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