nim -> nix

default.nix

@@ -1,5 +1,5 @@
 with import <nixpkgs> {}; let
-  nim_1_0 = callPackage ./overlay/nim_1_0.nim {};
+  nim_1_0 = callPackage ./overlay/nim_1_0.nix {};
 in rec {
   boomerEnv = stdenv.mkDerivation {
     name = "boomer-env";

overlay/default.nix

@@ -1,6 +1,6 @@
 self: super:
 
 {
-  nim_1_0 = super.callPackage ./nim_1_0.nim {};
+  nim_1_0 = super.callPackage ./nim_1_0.nix {};
   boomer = super.callPackage ./boomer.nix {};
 }