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Hercules CI evaluates in pure mode and re-derives the lock, walking the flake-lang -> haskell-nix -> hackage override chain and failing with 'cannot update unlocked flake input flake-lang/haskell-nix/hackage in pure mode'. flake-lang had a mutable branch ref; pin it to the exact rev the lock was built against so CI uses the committed lock as-is. Build is unchanged (lbr-plutus drv identical); nix flake check green. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The depth-2 hackage override (flake-lang -> haskell-nix -> hackage) can't be evaluated by Hercules CI in pure mode (it re-locks the transitive input and can't fetch it), which is why CI kept failing with 'cannot update unlocked flake input ... in pure mode'. Replace it: keep only the depth-1 CHaP override (immutable rev, which CI accepts) for plutus 1.65, leave haskell.nix + its bundled hackage.nix at flake-lang's defaults (index-state 2025-09-27), and inject the one package that only gained GHC 9.12 support later — proto-lens 0.7.1.7 — as a haskell.nix extraHackage source dependency (settings.haskell.proto-lens-deps, fetched with submodules and symlinks dereferenced) into the compiler/codegen/frontend projects. nix flake check green (226/226). Build outputs unchanged for the runtimes. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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this branch updates dependencies and gets the build running under van-rossum compatible package set