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Add GHC 9.14 - #9
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- Stackage has no 9.14 snapshot yet, so stack-9.14.1.yaml overrides the compiler on a 9.12 nightly, the way codedown does. - Needs a newer haskell.nix for ghc9141, which floors at GHC 9.6, so 9.2 and 9.4 now build against the haskellNixOld pin that was already here for darwin. - sandwich 0.3.1.0 made createProcessWithLogging also return the output Async.
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Builds and passes all 20 tests on GHC 9.14.1.
Stackage has no 9.14 snapshot yet (today's nightly is still 9.12.4), so
stack-9.14.1.yamloverridescompiler:on a 9.12 nightly withallow-newer, the way codedown's own 9.14 build does. The nightly is 2026-07-31 rather than something newer because later ones pull inhgg, whose generated hackage.nix has an invalid attribute name (3d = false;) and fails to parse.Two knock-on changes:
ghc9141. Upstream master has it, so no fork is needed, but it floors at GHC 9.6 — so 9.2 and 9.4 now go through thehaskellNixOldpin that was already here for darwin, which still hasghc928andghc948.pkgsOldwas previously built with the new haskell.nix overlay; it now gets the old one, and there's aflakeStaticOldfor the static variants.haskell.compiler.ghc9122from the devShell (nowghc9141), and the newer snapshot's sandwich 0.3.1.0 changedcreateProcessWithLoggingto also return the outputAsync.Depends on codedownio/IHaskell#1 — pinned here at 41564ba.
Verified locally with stack on 9.14.1 (library, exe, both test suites, benchmark; tests pass) and by evaluating the flake targets — 9.2 through 9.12 plus 9.14 and most of the static variants resolve to derivations. The builds themselves are left to CI.