Fix nix build CI

.github/workflows/nix.yml

@@ -89,8 +89,6 @@ jobs:
 
     - uses: cachix/install-nix-action@v18
       with:
-        install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
-        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
         extra_nix_config: |
           experimental-features = nix-command flakes
         nix_path: nixpkgs=channel:nixos-unstable

flake.nix

@@ -59,6 +59,10 @@
       url = "https://hackage.haskell.org/package/hiedb-0.4.2.0/hiedb-0.4.2.0.tar.gz";
       flake = false;
     };
+    implicit-hie = {
+      url = "https://hackage.haskell.org/package/implicit-hie-0.1.2.7/implicit-hie-0.1.2.7.tar.gz";
+      flake = false;
+    };
   };
   outputs =
     inputs@{ self, nixpkgs, flake-compat, flake-utils, gitignore, all-cabal-hashes-unpacked, ... }:
@@ -122,6 +126,7 @@
               # Patches don't apply
               github = overrideCabal hsuper.github (drv: { patches = []; });
               hiedb = hsuper.callCabal2nix "hiedb" inputs.hiedb {};
+              implicit-hie = hsuper.callCabal2nix "implicit-hie" inputs.implicit-hie {};
 
               # https://github.com/NixOS/nixpkgs/issues/140774
               ormolu =

ghcide/ghcide.cabal

@@ -104,6 +104,11 @@ library
         ghc-paths,
         cryptohash-sha1 >=0.11.100 && <0.12,
         hie-bios ^>= 0.11.0,
+        -- implicit-hie 0.1.3.0 introduced an unexpected behavioral change.
+        -- https://github.com/Avi-D-coder/implicit-hie/issues/50
+        -- to make sure ghcide behaves in a desirable way, we put implicit-hie
+        -- fake dependency here.
+        implicit-hie < 0.1.3,
         implicit-hie-cradle ^>= 0.3.0.5 || ^>= 0.5,
         base16-bytestring >=0.1.1 && <1.1
     if os(windows)

plugins/hls-cabal-plugin/hls-cabal-plugin.cabal

@@ -45,7 +45,6 @@ library
     -- This is a lot of work for almost zero benefit, so we just allow more versions here
     -- and we eventually completely drop support for building HLS with stack.
     , Cabal                 ^>=3.2 || ^>=3.4 || ^>=3.6 || ^>= 3.8
-    , Cabal-syntax          ^>= 3.6
     , deepseq
     , directory
     , extra                 >=1.7.4