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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Marge Bot pushed to branch master at <a href="https://gitlab.haskell.org/ghc/ghc" style="color: #1068bf;">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/13d627bbd0bc3dd30d672de341aa7f471be0aa2c" style="color: #1068bf;">13d627bb</a></strong>
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<span> by Vladislav Zavialov </span> <i> at 2022-11-25T04:39:04-05:00 </i>
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<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Print unticked promoted data constructors (#20531)

Before this patch, GHC unconditionally printed ticks before promoted
data constructors:

        ghci> type T = True  -- unticked (user-written)
        ghci> :kind! T
        T :: Bool
        = 'True              -- ticked (compiler output)

After this patch, GHC prints ticks only when necessary:

        ghci> type F = False    -- unticked (user-written)
        ghci> :kind! F
        F :: Bool
        = False                 -- unticked (compiler output)

        ghci> data False        -- introduce ambiguity
        ghci> :kind! F
        F :: Bool
        = 'False                -- ticked by necessity (compiler output)

The old behavior can be enabled by -fprint-redundant-promotion-ticks.

Summary of changes:
* Rename PrintUnqualified to NamePprCtx
* Add QueryPromotionTick to it
* Consult the GlobalRdrEnv to decide whether to print a tick (see mkPromTick)
* Introduce -fprint-redundant-promotion-ticks

Co-authored-by: Artyom Kuznetsov <hi@wzrd.ht>
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30 changed files:
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compiler/GHC/Types/Name/Ppr.hs
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compiler/GHC/Utils/Error.hs
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The diff was not included because it is too large.
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