Describe the bug

Could not enter nix-shell for haskell project, build is fine.

Steps To Reproduce

Steps to reproduce the behavior:
1 install nix
2 nix-env --install cabal2nix
3 files:

• LICENSE
• default.nix:

  { pkgs ? import <nixpkgs> { }}:
  pkgs.haskellPackages.callCabal2nix "project0" ./. { }

• project0.cabal:

  name: project0
  version: 1.0.0
  license: BSD3
  license-file: LICENSE
  cabal-version: >= 1.18
  build-type: Simple
  
  executable project0
      build-depends: base 
      main-is: Main.hs
      default-language: Haskell2010
  

• main.hs

  module Main where
  
  main :: IO ()
  main = putStrLn "Hello, world!"
  

4 nix-build works fine
5 could not enter nix-shell

➜ nix-shell --attr env
error: Package ‘compiler-rt-libc-9.0.1’ in /nix/store/m1pmrzsdyk4d2d9hsacnp73d4lj2nwfy-nixpkgs-21.11pre333180.98747f27ecf/nixpkgs/pkgs/development/compilers/llvm/9/compiler-rt/default.nix:95 is marked as broken, refusing to evaluate.

       a) To temporarily allow broken packages, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_BROKEN=1

       b) For `nixos-rebuild` you can set
         { nixpkgs.config.allowBroken = true; }
       in configuration.nix to override this.

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowBroken = true; }
       to ~/.config/nixpkgs/config.nix.
(use '--show-trace' to show detailed location information)

Expected behavior

Should enter nix-shell

Metadata

• system: "aarch64-darwin"
• host os: Darwin 21.1.0, macOS 12.0.1
• multi-user?: yes
• sandbox: no
• version: nix-env (Nix) 2.4
• channels(ares): "darwin"
• channels(root): "nixpkgs-21.11pre333180.98747f27ecf"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixpkgs