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ci: constrain megaparsec < 9.8 on GHC < 9.10 #1630

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parsonsmatt merged 2 commits into from
Jun 22, 2026
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ci: constrain megaparsec < 9.8 on GHC < 9.10 #1630

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ac31991
ci: constrain megaparsec < 9.8 on GHC < 9.10
jkeuhlen Jun 18, 2026
1085cea
ci: constrain megaparsec < 9.8 across all GHCs
jkeuhlen Jun 18, 2026
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10 changes: 10 additions & 0 deletions cabal.project
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Expand Up @@ -20,6 +20,16 @@ allow-newer:
, bytestring-lexing:base
, postgresql-simple-interval:persistent

-- megaparsec 9.8.0 breaks the build in two ways:
-- * On GHC < 9.10 it fails to compile ("Variable not in scope: foldl'"),
-- because it relies on `foldl'` being re-exported from Prelude, which only
-- happens as of base-4.20 (GHC 9.10).
-- * On GHC >= 9.10 it compiles but changes how parse errors are rendered
-- (the `^` caret under the offending token), which breaks the expected
-- strings in Database.Persist.Quasi's test suite.
-- Pin to < 9.8 across the whole matrix until the suite is updated upstream.
constraints: megaparsec < 9.8

source-repository-package
type: git
location: https://github.com/parsonsmatt/mysql
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