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dhall-lang#2542 allowed `dhall` to compile with template-haskell-2.21 and GHC-9.8 by adapting to the addition of a binder visibility field on type variables. Previously all binders were taken to be required, but in GHC-9.8 the possibility of invisible binders was introduced. The above patch mistakenly set all binders generated by Dhall to be invisible, rather than default value of required. This changes the semantics of the code and broke some examples in the test suite. This patch fixes this by correctly setting binders to be BndrReq. Resolves dhall-lang#2567
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You should also consider whether it's worth deprecating versions of dhall between this bug being introduced and fixed as users using the TH functions with GHC 9.8+ will have generated broken code. Or maybe just releasing revisions that disable the broken combination of dhall and template-haskell. |
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This is great, thank you! Tagging @Gabriella439, not sure if you're subscribed. |
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Submitted to get dhall-1.42.2 added to the current Stackage LTS for GHC 9.8. That includes this patch |
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#2542 allowed
dhallto compile with template-haskell-2.21 and GHC-9.8 by adapting to the addition of a binder visibility field on type variables.Previously all binders were taken to be required, but in GHC-9.8 the possibility of invisible binders was introduced.
The above patch mistakenly set all binders generated by Dhall to be invisible, rather than default value of required. This changes the semantics of the code and broke some examples in the test suite.
This patch fixes this by correctly setting binders to be BndrReq.
Resolves #2567