Configuration parse error

[asheshambasta]

I see the following logs in the *lsp-log* buffer:

haskell-lsp:configuration parse error. RequestMessage {_jsonrpc = "2.0", _id = IdInt 233, _method = Initialize, _params = InitializeParams {_processId = Just 24529, _rootPath = Just "/home/ashesh/code/centralapp/transactor/", _rootUri = Just (Uri {getUri = "file:///home/ashesh/code/centralapp/transactor/"}), _initializationOptions = Just (String "lsp-haskell--make-init-options"), _capabilities = ClientCapabilities {_workspace = Just (WorkspaceClientCapabilities {_applyEdit = Just True, _workspaceEdit = Just (WorkspaceEditClientCapabilities {_documentChanges = Just True}), _didChangeConfiguration = Nothing, _didChangeWatchedFiles = Just (DidChangeWatchedFilesClientCapabilities {_dynamicRegistration = Just True}), _symbol = Just (SymbolClientCapabilities {_dynamicRegistration = Nothing, _symbolKind = Just (SymbolKindClientCapabilities {_valueSet = Just (List [SkFile,SkModule,SkNamespace,SkPackage,SkClass,SkMethod,SkProperty,SkField,SkConstructor,SkEnum,SkInterface,SkFunction,SkVariable,SkConstant,SkString,SkNumber,SkBoolean,SkArray,SkObject,SkKey,SkNull,SkEnumMember,SkStruct,SkEvent,SkOperator,SkTypeParameter])})}), _executeCommand = Just (ExecuteClientCapabilities {_dynamicRegistration = Just False}), _workspaceFolders = Just True, _configuration = Just True}), _textDocument = Just (TextDocumentClientCapabilities {_synchronization = Just (SynchronizationTextDocumentClientCapabilities {_dynamicRegistration = Nothing, _willSave = Just True, _willSaveWaitUntil = Just True, _didSave = Just True}), _completion = Just (CompletionClientCapabilities {_dynamicRegistration = Nothing, _completionItem = Just (CompletionItemClientCapabilities {_snippetSupport = Just True, _commitCharactersSupport = Nothing, _documentationFormat = Just (List [MkMarkdown]), _deprecatedSupport = Nothing, _preselectSupport = Nothing}), _completionItemKind = Nothing, _contextSupport = Just True}), _hover = Just (HoverClientCapabilities {_dynamicRegistration = Nothing, _contentFormat = Just (List [MkMarkdown,MkPlainText])}), _signatureHelp = Just (SignatureHelpClientCapabilities {_dynamicRegistration = Nothing, _signatureInformation = Just (SignatureInformationClientCapabilities {documentationFormat = Nothing})}), _references = Nothing, _documentHighlight = Nothing, _documentSymbol = Just (DocumentSymbolClientCapabilities {_dynamicRegistration = Nothing, _symbolKind = Just (DocumentSymbolKindClientCapabilities {_valueSet = Just (List [SkFile,SkModule,SkNamespace,SkPackage,SkClass,SkMethod,SkProperty,SkField,SkConstructor,SkEnum,SkInterface,SkFunction,SkVariable,SkConstant,SkString,SkNumber,SkBoolean,SkArray,SkObject,SkKey,SkNull,SkEnumMember,SkStruct,SkEvent,SkOperator,SkTypeParameter])}), _hierarchicalDocumentSymbolSupport = Just True}), _formatting = Just (FormattingClientCapabilities {_dynamicRegistration = Just True}), _rangeFormatting = Nothing, _onTypeFormatting = Nothing, _definition = Just (DefinitionClientCapabilities {_dynamicRegistration = Nothing}), _typeDefinition = Just (TypeDefinitionClientCapabilities {_dynamicRegistration = Nothing}), _implementation = Just (ImplementationClientCapabilities {_dynamicRegistration = Nothing}), _codeAction = Just (CodeActionClientCapabilities {_dynamicRegistration = Just True, _codeActionLiteralSupport = Just (CodeActionLiteralSupport {_codeActionKind = CodeActionKindClientCapabilities {_valueSet = List [CodeActionUnknown "",CodeActionQuickFix,CodeActionRefactor,CodeActionRefactorExtract,CodeActionRefactorInline,CodeActionRefactorRewrite,CodeActionSource,CodeActionSourceOrganizeImports]}})}), _codeLens = Nothing, _documentLink = Just (DocumentLinkClientCapabilities {_dynamicRegistration = Just True}), _colorProvider = Nothing, _rename = Nothing, _publishDiagnostics = Nothing, _foldingRange = Just (FoldingRangeClientCapabilities {_dynamicRegistration = Just True, _rangeLimit = Nothing, _lineFoldingOnly = Just False})}), _window = Nothing, _experimental = Nothing}, _trace = Nothing, _workspaceFolders = Nothing}} "expected Config, encountered String"

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Following which lsp-ui completely stops working for me: code warnings / type information etc. stops working.

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PS:
What I also see is that I'm hitting the hie process pretty hard after every keystroke. This overall makes typing really laggy.

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What could be going on here?

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System information:

GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.5) of 2019-09-13

Emacs lsp related packages:

lsp-mode           6.1           
lsp-ui             20191030.1350
lsp-haskell        20190602.825  dependency            Haskell support for lsp-mode

[alanz]

Which hie version are you using?

[asheshambasta]

@alanz do you mean the HIE version? If so, this is hie-8.4.4.

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Edit:

Version 0.13.0.0 x86_64 ghc-8.4.4
(my apologies for the incomplete information above)

[ncihnegn]

Same issue here. Using hie 0.13.0.0.

[ashkan-leo]

Same issue here.
Using Version 1.0.0.0, Git revision 2c51b612d4f584e7f543961cf2a231139df8930b (3507 commits) x86_64 ghc-8.6.5 on macOS Catalina

[dalvescb]

Same issue here, using version 1.0.0.0, ghc-8.6.5 on arch linux

[d12frosted]

The same issue if I compile on top of hie master. If I compile from 0.14.0.0 branch - everything is fine.

[alanz]

My initial investigations show that this is a longstanding bug in haskell-lsp, we are just being more proactive with showing problems back in the client.

[alanz]

Looking into this more deeply, I see the emacs lsp-haskell is now providing a value of

  , _initializationOptions = Just (String "lsp-haskell--make-init-options")

which indicates that the lsp-haskell--make-init-options must exist and return something that prevents the field from being populated.

[d12frosted]

I confirm, this helps! Thanks a lot!