Describe the bug
Trying to enable i2pd service in 20.03 throws an error (no issue in 19.09):

# nixos-rebuild build --show-trace
called from /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/services/networking/i2pd.nix:162:8:
value is a function while a Boolean was expected

Points to

9bab9e2#diff-37149d49e0c6f771a32bc9053c70ad19R162

To Reproduce

  services.i2pd = {
    enable = true;
  };

Notify maintainers
@edwtjo

Relates to #77189.

Metadata

• system: "x86_64-linux"
• host os: Linux 5.4.35-hardened, NixOS, 20.03.1619.ab3adfe1c76 (Markhor)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.3.4
• channels(root): "nixos-20.03.1619.ab3adfe1c76"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos