shards: minor cleanups

pkgs/development/tools/build-managers/shards/default.nix

@@ -3,13 +3,9 @@
 , crystal_0_34
 , crystal_0_35
 }:
-
 let
-  generic = (
-    { version
-    , sha256
-    , crystal
-    }:
+  generic =
+    { version, sha256, crystal }:
 
     crystal.buildCrystalPackage {
       pname = "shards";
@@ -17,12 +13,12 @@ let
 
       src = fetchFromGitHub {
         owner = "crystal-lang";
-        repo  = "shards";
-        rev   = "v${version}";
+        repo = "shards";
+        rev = "v${version}";
         inherit sha256;
       };
 
-      # we cannot use `make` here as it would introduce a dependency on itself
+      # we cannot use `make` or `shards` here as it would introduce a cyclical dependency
       format = "crystal";
       shardsFile = ./shards.nix;
       crystalBinaries.shards.src = "./src/shards.cr";
@@ -36,10 +32,10 @@ let
         maintainers = with maintainers; [ peterhoeg ];
         inherit (crystal.meta) homepage platforms;
       };
-    }
-  );
+    };
 
-in rec {
+in
+rec {
   shards_0_11 = generic {
     version = "0.11.1";
     sha256 = "05qnhc23xbmicdl4fwyxfpcvd8jq4inzh6v7jsjjw4n76vzb1f71";