x/tools/gopls: syntax error in go.mod blocks progress end notification

[j-hui]

gopls version

$ gopls -v version
Build info
----------
golang.org/x/tools/gopls v0.7.5
    golang.org/x/tools/gopls@v0.7.5 h1:8Az52YwcFXTWPvrRomns1C0N+zlgTyyPKWvRazO9GG8=
    github.com/BurntSushi/toml@v0.4.1 h1:GaI7EiDXDRfa8VshkTj7Fym7ha+y8/XxIgD2okUIjLw=
    github.com/google/go-cmp@v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
    github.com/sergi/go-diff@v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
    golang.org/x/mod@v0.5.1 h1:OJxoQ/rynoF0dcCdI7cLPktw/hR2cueqYfjm43oqK38=
    golang.org/x/sync@v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
    golang.org/x/sys@v0.0.0-20211019181941-9d821ace8654 h1:id054HUawV2/6IGm2IV8KZQjqtwAOo2CYlOToYqa0d0=
    golang.org/x/text@v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
    golang.org/x/tools@v0.1.9-0.20220114220130-fd7798718afd h1:lTnuArxJC+n54TyvWUPyHhrnGxYvhSi13/aM2Ndr4bs=
    golang.org/x/xerrors@v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
    honnef.co/go/tools@v0.2.1 h1:/EPr//+UMMXwMTkXvCCoaJDq8cpjMO80Ou+L4PDo2mY=
    mvdan.cc/gofumpt@v0.1.1 h1:bi/1aS/5W00E2ny5q65w9SnKpWEF/UIOqDYBILpo9rA=
    mvdan.cc/xurls/v2@v2.3.0 h1:59Olnbt67UKpxF1EwVBopJvkSUBmgtb468E4GVWIZ1I=

go env

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/j-hui/.cache/go-build"
GOENV="/home/j-hui/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/j-hui/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/j-hui/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/j-hui/.local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/j-hui/.local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17.6"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3553807707=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I'm working on a Neovim plugin that exposes the builtin LSP client's progress handler: https://github.com/j-hui/fidget.nvim. Several users have reported issues using it gopls.

In particular, there were two problems:

1. Progress notifications seem to convey abnormally long messages.
2. Some progress notifications don't seem to go away.

What did you expect to see?

1. The notification message should just tell the user what it is working on. It should not communicate any diagnostic issues.
2. Once a task is complete, the LSP server should notify completion, even if the task terminated upon encountering failure.

What did you see instead?

1. Gopls notifies the client with extremely long diagnostic messages.
2. Gopls never notifies the progress handler of completion.

We came across this issue when the long messages triggered an error where we ran into the max length for Lua's format specifier. We're currently fixing that by trucating the string, which stops Neovim from throwin an error, but this does not seem to be a satisfactory way of conveying the error.

Editor and settings

We can reproduce the issue with the following repo: https://github.com/j-hui/gopls-test

Clone that repo down, install nvim version >0.6.0, and then run:

nvim -u init.vim go.mod '+set ft=go'

In the bottom right corner:

/home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod:6:2: usage: replace module/path [v1.2.3] => ot...
                                                                                          ├ gopls

Notice that:

1. The progress message is cut off.
2. The spinner never goes away.

Fidget's logs can be found at:

~/.local/share/nvim/fidget.nvim.log

I am receiving the following messages:

[DEBUG Fri 28 Jan 2022 11:30:34 AM EST] ...xtern/fidget-nvim-go-mod-demo/fidget.nvim/lua/fidget.lua:217: Received progress notification: {
  info = {
    client_id = 1,
    method = "$/progress"
  },
  msg = {
    token = "5577006791947779410",
    value = {
      kind = "begin",
      message = "Loading packages...",
      title = "Setting up workspace"
    }
  }
}
[DEBUG Fri 28 Jan 2022 11:30:34 AM EST] ...xtern/fidget-nvim-go-mod-demo/fidget.nvim/lua/fidget.lua:217: Received progress notification: {
  info = {
    client_id = 1,
    method = "$/progress"
  },
  msg = {
    token = "5577006791947779410",
    value = {
      kind = "end",
      message = "Finished loading packages."
    }
  }
}
[DEBUG Fri 28 Jan 2022 11:30:34 AM EST] ...xtern/fidget-nvim-go-mod-demo/fidget.nvim/lua/fidget.lua:217: Received progress notification: {
  info = {
    client_id = 1,
    method = "$/progress"
  },
  msg = {
    token = "8674665223082153551",
    value = {
      kind = "begin",
      message = "/home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod:6:2: usage: replace module/path [v1.2.3] => other/module v1.4 \t or replace module/path [v1.2.3] => ../local/directory",
      title = "Error loading workspace"
    }
  }
}
[DEBUG Fri 28 Jan 2022 11:30:34 AM EST] ...xtern/fidget-nvim-go-mod-demo/fidget.nvim/lua/fidget.lua:217: Received progress notification: {
  info = {
    client_id = 1,
    method = "$/progress"
  },
  msg = {
    token = "8674665223082153551",
    value = {
      kind = "report",
      message = "/home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod:6:2: usage: replace module/path [v1.2.3] => other/module v1.4 \t or replace module/path [v1.2.3] => ../local/directory"
    }
  }
}

Notice that task 8674665223082153551 never completes, and reports an error message.

Logs

I'm not sure how useful this is for this particular issue:

[Trace - 11:38:53.588 AM] Sending request 'initialize - (1)'.
Params: {"processId":2675499,"clientInfo":{"name":"Neovim","version":"0.6.0"},"initializationOptions":{},"trace":"off","workspaceFolders":[{"uri":"file:\/\/\/home\/j-hui\/extern\/fidget-nvim-go-mod-demo","name":"\/home\/j-hui\/extern\/fidget-nvim-go-mod-demo"}],"capabilities":{"workspace":{"workspaceFolders":true,"applyEdit":true,"workspaceEdit":{"resourceOperations":["rename","create","delete"]},"configuration":true,"symbol":{"symbolKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]},"dynamicRegistration":false,"hierarchicalWorkspaceSymbolSupport":true}},"textDocument":{"codeAction":{"dataSupport":true,"dynamicRegistration":false,"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["","Empty","QuickFix","Refactor","RefactorExtract","RefactorInline","RefactorRewrite","Source","SourceOrganizeImports","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}},"resolveSupport":{"properties":["edit"]}},"definition":{"linkSupport":true},"typeDefinition":{"linkSupport":true},"signatureHelp":{"signatureInformation":{"parameterInformation":{"labelOffsetSupport":true},"documentationFormat":["markdown","plaintext"],"activeParameterSupport":true},"dynamicRegistration":false},"hover":{"contentFormat":["markdown","plaintext"],"dynamicRegistration":false},"implementation":{"linkSupport":true},"completion":{"contextSupport":false,"completionItem":{"snippetSupport":false,"commitCharactersSupport":false,"preselectSupport":false,"deprecatedSupport":false,"documentationFormat":["markdown","plaintext"]},"dynamicRegistration":false,"completionItemKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]}},"rename":{"prepareSupport":true,"dynamicRegistration":false},"documentHighlight":{"dynamicRegistration":false},"documentSymbol":{"symbolKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]},"dynamicRegistration":false,"hierarchicalDocumentSymbolSupport":true},"synchronization":{"didSave":true,"dynamicRegistration":false,"willSave":false,"willSaveWaitUntil":false},"references":{"dynamicRegistration":false},"declaration":{"linkSupport":true},"publishDiagnostics":{"relatedInformation":true,"tagSupport":{"valueSet":[1,2]}}},"callHierarchy":{"dynamicRegistration":false},"window":{"workDoneProgress":true,"showMessage":{"messageActionItem":{"additionalPropertiesSupport":false}},"showDocument":{"support":false}}},"rootUri":"file:\/\/\/home\/j-hui\/extern\/fidget-nvim-go-mod-demo","rootPath":"\/home\/j-hui\/extern\/fidget-nvim-go-mod-demo"}


[Trace - 11:38:53.590 AM] Received response 'initialize - (1)' in 1ms.
Result: {"capabilities":{"textDocumentSync":{"openClose":true,"change":2,"save":{}},"completionProvider":{"triggerCharacters":["."],"completionItem":{}},"hoverProvider":true,"signatureHelpProvider":{"triggerCharacters":["(",","]},"definitionProvider":true,"typeDefinitionProvider":true,"implementationProvider":true,"referencesProvider":true,"documentHighlightProvider":true,"documentSymbolProvider":true,"codeActionProvider":{"codeActionKinds":["quickfix","refactor.extract","refactor.rewrite","source.fixAll","source.organizeImports"]},"codeLensProvider":{},"documentLinkProvider":{},"workspaceSymbolProvider":true,"documentFormattingProvider":true,"documentOnTypeFormattingProvider":{"firstTriggerCharacter":""},"renameProvider":{"prepareProvider":true},"foldingRangeProvider":true,"executeCommandProvider":{"commands":["gopls.add_dependency","gopls.add_import","gopls.apply_fix","gopls.check_upgrades","gopls.gc_details","gopls.generate","gopls.generate_gopls_mod","gopls.go_get_package","gopls.list_known_packages","gopls.regenerate_cgo","gopls.remove_dependency","gopls.run_tests","gopls.start_debugging","gopls.test","gopls.tidy","gopls.toggle_gc_details","gopls.update_go_sum","gopls.upgrade_dependency","gopls.vendor","gopls.workspace_metadata"]},"callHierarchyProvider":true,"workspace":{"workspaceFolders":{"supported":true,"changeNotifications":"workspace/didChangeWorkspaceFolders"}}},"serverInfo":{"name":"gopls","version":"{\"path\":\"golang.org/x/tools/gopls\",\"version\":\"v0.7.5\",\"sum\":\"h1:8Az52YwcFXTWPvrRomns1C0N+zlgTyyPKWvRazO9GG8=\",\"deps\":[{\"path\":\"github.com/BurntSushi/toml\",\"version\":\"v0.4.1\",\"sum\":\"h1:GaI7EiDXDRfa8VshkTj7Fym7ha+y8/XxIgD2okUIjLw=\"},{\"path\":\"github.com/google/go-cmp\",\"version\":\"v0.5.6\",\"sum\":\"h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=\"},{\"path\":\"github.com/sergi/go-diff\",\"version\":\"v1.1.0\",\"sum\":\"h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=\"},{\"path\":\"golang.org/x/mod\",\"version\":\"v0.5.1\",\"sum\":\"h1:OJxoQ/rynoF0dcCdI7cLPktw/hR2cueqYfjm43oqK38=\"},{\"path\":\"golang.org/x/sync\",\"version\":\"v0.0.0-20210220032951-036812b2e83c\",\"sum\":\"h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=\"},{\"path\":\"golang.org/x/sys\",\"version\":\"v0.0.0-20211019181941-9d821ace8654\",\"sum\":\"h1:id054HUawV2/6IGm2IV8KZQjqtwAOo2CYlOToYqa0d0=\"},{\"path\":\"golang.org/x/text\",\"version\":\"v0.3.7\",\"sum\":\"h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=\"},{\"path\":\"golang.org/x/tools\",\"version\":\"v0.1.9-0.20220114220130-fd7798718afd\",\"sum\":\"h1:lTnuArxJC+n54TyvWUPyHhrnGxYvhSi13/aM2Ndr4bs=\"},{\"path\":\"golang.org/x/xerrors\",\"version\":\"v0.0.0-20200804184101-5ec99f83aff1\",\"sum\":\"h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=\"},{\"path\":\"honnef.co/go/tools\",\"version\":\"v0.2.1\",\"sum\":\"h1:/EPr//+UMMXwMTkXvCCoaJDq8cpjMO80Ou+L4PDo2mY=\"},{\"path\":\"mvdan.cc/gofumpt\",\"version\":\"v0.1.1\",\"sum\":\"h1:bi/1aS/5W00E2ny5q65w9SnKpWEF/UIOqDYBILpo9rA=\"},{\"path\":\"mvdan.cc/xurls/v2\",\"version\":\"v2.3.0\",\"sum\":\"h1:59Olnbt67UKpxF1EwVBopJvkSUBmgtb468E4GVWIZ1I=\"}]}"}}


[Trace - 11:38:53.590 AM] Sending notification 'initialized'.
Params: {}


[Trace - 11:38:53.590 AM] Received request 'window/workDoneProgress/create - (1)'.
Params: {"token":"5577006791947779410"}


[Trace - 11:38:53.590 AM] Sending notification 'textDocument/didOpen'.
Params: {"textDocument":{"uri":"file:\/\/\/home\/j-hui\/extern\/fidget-nvim-go-mod-demo\/go.mod","text":"module demo\n\ngo 1.17\n\nreplace (\n\tgithub.com\/labstack\/echo\/v4 ..\/echo\n)\n\nrequire github.com\/labstack\/echo\/v4 v4.6.3\n\nrequire (\n\tgithub.com\/golang-jwt\/jwt v3.2.2+incompatible \/\/ indirect\n\tgithub.com\/labstack\/gommon v0.3.1 \/\/ indirect\n\tgithub.com\/mattn\/go-colorable v0.1.11 \/\/ indirect\n\tgithub.com\/mattn\/go-isatty v0.0.14 \/\/ indirect\n\tgithub.com\/valyala\/bytebufferpool v1.0.0 \/\/ indirect\n\tgithub.com\/valyala\/fasttemplate v1.2.1 \/\/ indirect\n\tgolang.org\/x\/crypto v0.0.0-20210817164053-32db794688a5 \/\/ indirect\n\tgolang.org\/x\/net v0.0.0-20210913180222-943fd674d43e \/\/ indirect\n\tgolang.org\/x\/sys v0.0.0-20211103235746-7861aae1554b \/\/ indirect\n\tgolang.org\/x\/text v0.3.7 \/\/ indirect\n\tgolang.org\/x\/time v0.0.0-20201208040808-7e3f01d25324 \/\/ indirect\n)\n","version":0,"languageId":"go"}}


[Trace - 11:38:53.592 AM] Sending response 'window/workDoneProgress/create - (1)' in 1ms.
Result: 


[Trace - 11:38:53.592 AM] Received notification '$/progress'.
Params: {"token":"5577006791947779410","value":{"kind":"begin","title":"Setting up workspace","message":"Loading packages..."}}


[Trace - 11:38:53.592 AM] Received request 'workspace/configuration - (2)'.
Params: {"items":[{"scopeUri":"file:///home/j-hui/extern/fidget-nvim-go-mod-demo","section":"gopls"}]}


[Trace - 11:38:53.594 AM] Sending response 'workspace/configuration - (2)' in 1ms.
Result: [null]


[Trace - 11:38:53.603 AM] Received notification 'window/logMessage'.
Params: {"type":1,"message":"2022/01/28 11:38:53 copying workspace dir: /home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod:6:2: usage: replace module/path [v1.2.3] =\u003e other/module v1.4\n\t or replace module/path [v1.2.3] =\u003e ../local/directory\n"}


[Trace - 11:38:53.603 AM] Received notification '$/progress'.
Params: {"token":"5577006791947779410","value":{"kind":"end","message":"Finished loading packages."}}


[Trace - 11:38:53.605 AM] Received notification 'window/logMessage'.
Params: {"type":3,"message":"2022/01/28 11:38:53 go env for /home/j-hui/extern/fidget-nvim-go-mod-demo\n(root /home/j-hui/extern/fidget-nvim-go-mod-demo)\n(go version go version go1.17.6 linux/amd64)\n(valid build configuration = true)\n(build flags: [])\nGOPRIVATE=\nGOPROXY=https://proxy.golang.org,direct\nGO111MODULE=\nGOPATH=/home/j-hui/go\nGOFLAGS=\nGONOSUMDB=\nGOINSECURE=\nGOSUMDB=sum.golang.org\nGOMOD=/home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod\nGOMODCACHE=/home/j-hui/go/pkg/mod\nGONOPROXY=\nGOROOT=/home/j-hui/.local/go\nGOCACHE=/home/j-hui/.cache/go-build\n\n"}


[Trace - 11:38:53.606 AM] Received request 'window/workDoneProgress/create - (3)'.
Params: {"token":"8674665223082153551"}


[Trace - 11:38:53.606 AM] Received notification 'window/logMessage'.
Params: {"type":1,"message":"2022/01/28 11:38:53 errors loading workspace: /home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod:6:2: usage: replace module/path [v1.2.3] =\u003e other/module v1.4\n\t or replace module/path [v1.2.3] =\u003e ../local/directory\n\tsnapshot=0\n\tdirectory=file:///home/j-hui/extern/fidget-nvim-go-mod-demo\n"}


[Trace - 11:38:53.606 AM] Sending response 'window/workDoneProgress/create - (3)' in 0ms.
Result: 


[Trace - 11:38:53.606 AM] Received notification '$/progress'.
Params: {"token":"8674665223082153551","value":{"kind":"begin","title":"Error loading workspace","message":"/home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod:6:2: usage: replace module/path [v1.2.3] =\u003e other/module v1.4 \t or replace module/path [v1.2.3] =\u003e ../local/directory"}}


[Trace - 11:38:53.606 AM] Received notification 'textDocument/publishDiagnostics'.
Params: {"uri":"file:///home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod","diagnostics":[{"range":{"start":{"line":0,"character":0},"end":{"line":0,"character":0}},"severity":1,"source":"go list","message":"/home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod:6:2: usage: replace module/path [v1.2.3] =\u003e other/module v1.4\n\t or replace module/path [v1.2.3] =\u003e ../local/directory"},{"range":{"start":{"line":5,"character":1},"end":{"line":5,"character":1}},"severity":1,"source":"syntax","message":"usage: replace module/path [v1.2.3] =\u003e other/module v1.4\n\t or replace module/path [v1.2.3] =\u003e ../local/directory"}]}


[Trace - 11:38:53.857 AM] Received notification '$/progress'.
Params: {"token":"8674665223082153551","value":{"kind":"report","message":"/home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod:6:2: usage: replace module/path [v1.2.3] =\u003e other/module v1.4 \t or replace module/path [v1.2.3] =\u003e ../local/directory"}}


[Trace - 11:38:53.857 AM] Received notification 'window/logMessage'.
Params: {"type":1,"message":"2022/01/28 11:38:53 errors loading workspace: /home/j-hui/extern/fidget-nvim-go-mod-demo/go.mod:6:2: usage: replace module/path [v1.2.3] =\u003e other/module v1.4\n\t or replace module/path [v1.2.3] =\u003e ../local/directory\n\tsnapshot=1\n\tdirectory=file:///home/j-hui/extern/fidget-nvim-go-mod-demo\n"}


[Trace - 11:38:59.323 AM] Sending request 'shutdown - (2)'.
Params: 


[Trace - 11:38:59.323 AM] Received notification 'window/logMessage'.
Params: {"type":3,"message":"2022/01/28 11:38:59 Shutdown session\n\tshutdown_session=1\n"}


[Trace - 11:38:59.323 AM] Received response 'shutdown - (2)' in 0ms.
Result: null


[Trace - 11:38:59.323 AM] Sending notification 'exit'.
Params: 

[hyangah]

Thanks for the report @j-hui

This was caused by syntax errors in go.mod.

replace (
	github.com/labstack/echo/v4 ../echo
)

This should be

replace (
	github.com/labstack/echo/v4 => ../echo
)

In VS Code, I saw gopls sending the progress end notification and the popup immediately going away as soon as I fixed the syntax error. So, wrt progress notification, I think gopls is working as expected.

However, there are still usability issues that need improvement.

1. The diagnostics & notification messages (usage: replace ...) are coming from the go command. The parse error message may be ok for the output of cli, but not so much in this case.

2. The same message is used for three places. 2 diagnostics, and 1 notification. The go command reports only the line number (not column number) for this error, so the exact syntax error location isn't obvious.

3. How to fix the issue is not obvious, especially for users who are not familiar with go.mod syntax. There was no code action, quick fix, or code lens for syntax error (not sure if that's possible). At lease, we should make the message clear to indicate "fix the broken go.mod file. then this notification will disappear".

[j-hui]

In VS Code, I saw gopls sending the progress end notification and the popup immediately goes away as soon as I fixed the syntax error. So, progress notification side, I think gopls is working as expected.

I realize this is a syntax error, but why is gopls reporting a diagnostic error in the progress notification? My understanding is that progress notifications are used to report progress, i.e., whether the LSP server is performing ongoing work. Reporting an error via an incomplete progress notification seems to convey the wrong idea about what the status of the language server.

If the intention is to show a popup message, shouldn't this be conveyed through something like the ShowMessage Notification endpoint?

[j-hui]

To be clear, this issue is not about how helpful the diagnostic for the syntax error is, but how the error is reported.

[hyangah]

Sorry if it wasn't clear. go.mod syntax error prevents successful workspace loading - it is a significant problem. The underlying go command couldn't provide any useful info with which gopls can do anything useful unless the go.mod file is fixed. There is currently no easy auto fix or fallback for gopls to do. So, it's sending a notification, begging for human action.

[j-hui]

Even if the workspace cannot load successfully, isn't the task still complete at that point? The way notifications are being sent gives the impression that the LSP server is performing ongoing work, even though it has already stopped (because it cannot recover). The LSP provides other facilities for reporting fatal errors to the user.

If gopls insists on sending an error message through the progress notification endpoint, it can also send a message through the work done progress endpoint, using the message field there.

[hyangah]

Gopls can't load the workspace but the loading blocks indefinitely, so the workspace load task (gopls's state initialization) isn't complete.
I will let @findleyr to think about the complexity of redesigning the architecture and the flow.

BTW, in VSCode, if the server stops without sending work done message, the client library clears it up.

[j-hui]

Thanks!

So far I haven't seen any other LSP servers behave this way, but I'm also unsure what is the "correct" behavior here---the LSP progress endpoint specification does not seem to make any mention of what to do if the server encounters an error.

I wasn't aware that VSCode's LSP client times out if it doesn't receive subsequent progress notifications. I can implement that in my plugin if that's the expected behavior; but do you know what the timeout is supposed to be?