$ nix-build scripts/check-compiler-materialization --argstr compiler-nix-name ghc8102
copying path '/nix/store/bhl876yha35vmdcw6fizr2fkmv54bvyi-cabal-install-3.2.0.0.tar.gz' from 'https://cache.nixos.org'...
building '/nix/store/5964rrj4ydfxqsdnwh8fvkijka47ilin-cabal-install-3.2.0.0-src.drv'...
error: attribute '1.20' missing, at /home/ielectric/dev/haskell.nix/overlays/haskell.nix:475:23