Try #4288:

Author: iohk-bors[bot]

cabal.project

@@ -12,10 +12,13 @@ repository cardano-haskell-packages
 
 -- See CONTRIBUTING for some Nix commands you will need to run if you
 -- update either of these.
--- Bump this if you need newer packages from Hackage
-index-state: 2022-12-01T00:00:00Z
--- Bump this if you need newer packages from CHaP
-index-state: cardano-haskell-packages 2022-11-15T00:00:00Z
+-- repeat the index-state for hackage to work around haskell.nix parsing limitation
+index-state: 2023-01-19T00:00:00Z
+index-state: 
+  -- Bump this if you need newer packages from Hackage
+  , hackage.haskell.org 2023-01-19T00:00:00Z
+  -- Bump this if you need newer packages from CHaP
+  , cardano-haskell-packages 2022-11-15T00:00:00Z
 
 packages: ./cardano-ping
           ./ouroboros-network-testing

nix/sources.json

@@ -17,10 +17,10 @@
         "homepage": "",
         "owner": "input-output-hk",
         "repo": "hackage.nix",
-        "rev": "a63a92060aa872b284db85fb914a7732931a0132",
-        "sha256": "1n211sgf43ymmi9bappp322gz8lrbgpqbgpbfk5hh234i5qkxqqr",
+        "rev": "bf364fc1eb12378e43c11a913fc8165702ce25c5",
+        "sha256": "1bhcyhwpn8vn7f4swa2lb8ygszm0905hq694k7mdvpwmk9fjn44y",
         "type": "tarball",
-        "url": "https://github.com/input-output-hk/hackage.nix/archive/a63a92060aa872b284db85fb914a7732931a0132.tar.gz",
+        "url": "https://github.com/input-output-hk/hackage.nix/archive/bf364fc1eb12378e43c11a913fc8165702ce25c5.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz",
         "version": "b3c99d7f13df89a9a918c835ecb7114098912962"
     },
@@ -30,10 +30,10 @@
         "homepage": "https://input-output-hk.github.io/haskell.nix",
         "owner": "input-output-hk",
         "repo": "haskell.nix",
-        "rev": "cbf1e918b6e278a81c385155605b8504e498efef",
-        "sha256": "1dc9h10ads7krj4izp79d1nilyli9z34hdxayqrs82dfdv7fqyqp",
+        "rev": "a8e1e1dda4490210cac21eac5830813fe73dc497",
+        "sha256": "0g2igvgizz7q7669c7xvbbcqihk6w96a7857g2lzs5k2wff3fp9b",
         "type": "tarball",
-        "url": "https://github.com/input-output-hk/haskell.nix/archive/cbf1e918b6e278a81c385155605b8504e498efef.tar.gz",
+        "url": "https://github.com/input-output-hk/haskell.nix/archive/a8e1e1dda4490210cac21eac5830813fe73dc497.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz",
         "version": "962ecfed3a4fb656b5a91d89159291e00ed766bc"
     },

shell.nix

@@ -31,7 +31,7 @@ let
       # IDE tools
       ghcid = "0.8.7";
       hasktags = "0.71.2";
-      haskell-language-server = "latest";
+      haskell-language-server = "1.8.0.0";
       # Draw graph of module dependencies
       graphmod = "1.4.4";
       # Profiling tools