Add nixpkgs-2511

Author: hamishmack

ci.nix

@@ -18,7 +18,7 @@
 
   # short names for nixpkgs versions
   nixpkgsVersions = {
-    "R2505" = inputs.nixpkgs-2505;
+    "R2511" = inputs.nixpkgs-2511;
     "unstable" = inputs.nixpkgs-unstable;
   };
 
@@ -64,7 +64,7 @@
       # cabal-install and nix-tools plans.  When removing a ghc version
       # from here (so that is no longer cached) also remove ./materialized/ghcXXX.
       # Update supported-ghc-versions.md to reflect any changes made here.
-      nixpkgs.lib.optionalAttrs (builtins.elem nixpkgsName ["R2411" "R2505"]) {
+      nixpkgs.lib.optionalAttrs (builtins.elem nixpkgsName ["R2411" "R2505" "R2511"]) {
         ghc96 = false;
         ghc98 = false;
         ghc98llvm = false;

default.nix

@@ -100,6 +100,9 @@ self // {
   pkgs-2505 = import self.inputs.nixpkgs-2505 (nixpkgsArgs // {
     localSystem = { inherit system; };
   });
+  pkgs-2511 = import self.inputs.nixpkgs-2511 (nixpkgsArgs // {
+    localSystem = { inherit system; };
+  });
   pkgs-unstable = import self.inputs.nixpkgs-unstable (nixpkgsArgs // {
     localSystem = { inherit system; };
   });

flake.lock

@@ -8,6 +8,7 @@
     nixpkgs-2405 = { url = "github:NixOS/nixpkgs/nixpkgs-24.05-darwin"; };
     nixpkgs-2411 = { url = "github:NixOS/nixpkgs/nixpkgs-24.11-darwin"; };
     nixpkgs-2505 = { url = "github:NixOS/nixpkgs/nixpkgs-25.05-darwin"; };
+    nixpkgs-2511 = { url = "github:NixOS/nixpkgs/nixpkgs-25.11-darwin"; };
     nixpkgs-unstable = { url = "github:NixOS/nixpkgs/nixpkgs-unstable"; };
     flake-compat = { url = "github:input-output-hk/flake-compat/hkm/gitlab-fix"; flake = false; };
     "hls-1.10" = { url = "github:haskell/haskell-language-server/1.10.0.0"; flake = false; };