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haskellvscode-extensions

vscode-haskell extension cannot change ghc version

I am having problems when using the vscode-haskell extension.

I am using ghcup to manage all my haskell related stuff.

Haskell TUI output

I want to use haskell 9.4.8 for my exercise, but the hls is keeping popping this and unable to provide autocomplete support. Can anyone help?

enter image description here

My Vscode Workspace settings are

{
  "haskell.manageHLS": "GHCup",
  "haskell.serverEnvironment": {
    "PATH": "${HOME}/.ghcup/bin:$PATH"
  },
  "haskell.toolchain": {
    "ghc": "9.4.8",
    "hls": "2.5.0.0",
    "cabal": "recommended"
  }
}

enter image description here

2024-01-18T03:15:08.330017Z | Error | LSP: no handler for: "textDocument/didOpen"
2024-01-18T03:15:08.330316Z | Debug | LSP: set new config: {
  "checkProject": true,
  "formattingProvider": "brittany",
  "ghcupExecutablePath": "",
  "indentationRules": { "enabled": true },
  "logFile": "",
  "manageHLS": "GHCup",
  "maxCompletions": 40,
  "metadataURL": "",
  "openDocumentationInHackage": true,
  "openSourceInHackage": true,
  "plugin": {
    "alternateNumberFormat": { "globalOn": true },
    "cabal": {
      "codeActionsOn": true,
      "completionOn": true,
      "diagnosticsOn": true
    },
    "callHierarchy": { "globalOn": true },
    "changeTypeSignature": { "globalOn": true },
    "class": { "codeActionsOn": true, "codeLensOn": true },
    "eval": {
      "config": { "diff": true, "exception": false },
      "globalOn": true
    },
    "explicit-fields": { "globalOn": true },
    "explicit-fixity": { "globalOn": true },
    "fourmolu": { "config": { "external": false } },
    "gadt": { "globalOn": true },
    "ghcide-code-actions-bindings": { "globalOn": true },
    "ghcide-code-actions-fill-holes": { "globalOn": true },
    "ghcide-code-actions-imports-exports": { "globalOn": true },
    "ghcide-code-actions-type-signatures": { "globalOn": true },
    "ghcide-completions": {
      "config": { "autoExtendOn": true, "snippetsOn": true },
      "globalOn": true
    },
    "ghcide-hover-and-symbols": { "hoverOn": true, "symbolsOn": true },
    "ghcide-type-lenses": { "config": { "mode": "always" }, "globalOn": true },
    "hlint": {
      "codeActionsOn": true,
      "config": { "flags": [  ] },
      "diagnosticsOn": true
    },
    "importLens": { "codeActionsOn": true, "codeLensOn": true },
    "moduleName": { "globalOn": true },
    "ormolu": { "config": { "external": false } },
    "overloaded-record-dot": { "globalOn": true },
    "pragmas-completion": { "globalOn": true },
    "pragmas-disable": { "globalOn": true },
    "pragmas-suggest": { "globalOn": true },
    "qualifyImportedNames": { "globalOn": true },
    "rename": { "config": { "crossModule": false }, "globalOn": true },
    "retrie": { "globalOn": true },
    "semanticTokens": {
      "config": {
        "classMethodToken": "method",
        "classToken": "class",
        "dataConstructorToken": "enumMember",
        "functionToken": "function",
        "patternSynonymToken": "macro",
        "recordFieldToken": "property",
        "typeConstructorToken": "enum",
        "typeFamilyToken": "interface",
        "typeSynonymToken": "type",
        "typeVariableToken": "typeParameter",
        "variableToken": "variable"
      },
      "globalOn": false
    },
    "splice": { "globalOn": true },
    "stan": { "globalOn": false }
  },
  "promptBeforeDownloads": "true",
  "releasesDownloadStoragePath": "",
  "releasesURL": "",
  "serverEnvironment": { "PATH": "${HOME}/.ghcup/bin:$PATH" },
  "serverExecutablePath": "",
  "serverExtraArgs": "",
  "toolchain": { "cabal": "recommended", "ghc": "9.4.8", "hls": "2.5.0.0" },
  "trace": { "client": "debug", "server": "messages" },
  "upgradeGHCup": true
}

Here I attach the output of vscode-haskell.

Solution

  • Your project is a stack project which means that resolver field in stack.yaml controls the ghc version and not GHCUp. For example, resolver version lts-21.25 has ghc version 9.4.8.

    Change the resolver version to lts-21.25 and that should fix it.