x/tools/gopls: intellisense dropdown not working with log/slog package in VSCode

[soypat]

gopls version

Build info

golang.org/x/tools/gopls v0.18.0
golang.org/x/tools/gopls@v0.18.0 h1:oBmnrmi0Uk7Ea+ZPK16BdcjnpEJX8ciBCSp9S90GULo=
github.com/BurntSushi/toml@v1.4.1-0.20240526193622-a339e1f7089c h1:pxW6RcqyfI9/kWtOwnv/G+AzdKuy2ZrqINhenH4HyNs=
github.com/google/go-cmp@v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
golang.org/x/exp/typeparams@v0.0.0-20241210194714-1829a127f884 h1:1xaZTydL5Gsg78QharTwKfA9FY9CZ1VQj6D/AZEvHR0=
golang.org/x/mod@v0.23.0 h1:Zb7khfcRGKk+kqfxFaP5tZqCnDZMjC5VtUBs87Hr6QM=
golang.org/x/sync@v0.11.0 h1:GGz8+XQP4FvTTrjZPzNKTMFtSXH80RAzG+5ghFPgK9w=
golang.org/x/telemetry@v0.0.0-20241220003058-cc96b6e0d3d9 h1:L2k9GUV2TpQKVRGMjN94qfUMgUwOFimSQ6gipyJIjKw=
golang.org/x/text@v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
golang.org/x/tools@v0.30.1-0.20250220174815-31e3bb2b8fd1 h1:4+it9JYqVd2wIAapscAb5mUAI1yHY0u4B4idYPigWeE=
golang.org/x/vuln@v1.1.3 h1:NPGnvPOTgnjBc9HTaUx+nj+EaUYxl5SJOWqaDYGaFYw=
honnef.co/go/tools@v0.5.1 h1:4bH5o3b5ZULQ4UrBmP+63W9r7qIkqJClEA9ko5YKx+I=
mvdan.cc/gofumpt@v0.7.0 h1:bg91ttqXmi9y2xawvkuMXyvAA/1ZGJqYAEGjXuP0JXU=
mvdan.cc/xurls/v2@v2.5.0 h1:lyBNOm8Wo71UknhUs4QTFUNNMyxy2JEIaKKo0RWOh+8=
go: go1.24.0

go env

$ go env
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE=''
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/home/pato/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/home/pato/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build4240856941=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/home/pato/Documents/src/tg/lneto/go.mod'
GOMODCACHE='/home/pato/go/pkg/mod'
GONOPROXY='gitlab.com/NovoSpace'
GONOSUMDB='gitlab.com/NovoSpace'
GOOS='linux'
GOPATH='/home/pato/go'
GOPRIVATE='gitlab.com/NovoSpace'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/pato/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.0'
GOWORK=''
PKG_CONFIG='pkg-config'

What did you do?

Happened with both Go 1.23.6 installed via Arch package repository and Go 1.24.0 installed via go.dev instructions.

Open any project, start typing in slog.* where slog project used and imported.

What did you see happen?

No intellisense display of available identifiers in log/slog package.

What did you expect to see?

All identifiers being displayed. Happens with every other single Go package except unsafe (which even then exposes identifiers as "words"), which I suppose is expected. log package intellisense works.

Editor and settings

{
"workbench.sideBar.location": "right",
"workbench.colorTheme": "GitHub Dark High Contrast",
"explorer.confirmDelete": false,
"gopls":{
"verboseOutput": true,
},
}

Logs

The instructions to enable logging and the serve flag are unclear. I enabled verbose output:

2025-02-20 17:36:47.291 [info] Try to start language server - activation (enabled: true)
2025-02-20 17:36:47.348 [info] Running language server gopls(v0.18.0/go1.24.0)
2025-02-20 17:39:24.291 [info] Try to start language server - activation (enabled: true)
2025-02-20 17:39:24.346 [info] Running language server gopls(v0.18.0/go1.24.0)
2025-02-20 17:39:37.181 [info] Running checks...
2025-02-20 17:39:37.181 [info] Starting linting the current package at /home/pato/Documents/src/tg/lneto/examples/stack
2025-02-20 17:39:37.274 [info] /home/pato/Documents/src/tg/lneto/examples/stack>Finished running tool: /home/pato/go/bin/staticcheck
2025-02-20 17:39:37.274 [info] /home/pato/Documents/src/tg/lneto/examples/stack/main.go:44:12 syntax error: unexpected newline in argument list; possibly missing comma or )
2025-02-20 17:39:37.274 [info] /home/pato/Documents/src/tg/lneto/examples/stack/main.go:45:74 syntax error: unexpected ) after top level declaration
2025-02-20 17:39:37.274 [info] /home/pato/Documents/src/tg/lneto/examples/stack/main.go:60:2 syntax error: non-declaration statement outside function body (compile)
2025-02-20 17:39:37.274 [info] 
2025-02-20 17:39:41.281 [info] Running checks...
2025-02-20 17:39:41.282 [info] Starting linting the current package at /home/pato/Documents/src/tg/lneto/examples/stack
2025-02-20 17:39:41.364 [info] /home/pato/Documents/src/tg/lneto/examples/stack>Finished running tool: /home/pato/go/bin/staticcheck
2025-02-20 17:39:41.364 [info] /home/pato/Documents/src/tg/lneto/examples/stack/main.go:44:2 not enough arguments in call to slog.New
2025-02-20 17:39:41.364 [info] 

[gabyhelp]

Related Issues

• x/tools/gopls: not working #37119 (closed)
• x/tools/gopls: gopls doc viewer failed with "package not found" error #70453 (closed)
• x/tools/gopls: IDE shows undeclared name on every symbols when accessing from other files #34951 (closed)
• x/tools/internal/lsp: doesn't work with VS Code on Windows #30967 (closed)
• x/tools/gopls: Completion not working in modules with "vendor" as their name #54071 (closed)
• x/tools/gopls: run completion using partial type checking of current package #68063
• x/tools/gopls: reporting "no views" when starting ( go installed from msys2 ) #68305 (closed)
• x/tools/gopls: missing completion of current module packages #67528
• gopls: Unable to build on vscode #35531 (closed)
• x/tools/gopls: gopls implementation result does not include all types in vendor directory #56169 (closed)

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[adonovan]

Very strange. One thought: what version of Go appears in your go.mod file? (Or: hover over the package declaration in your current source file and look for "Language version".) If it is less than go1.21 then completion won't offer log/slog. I doubt that can be the explanation though, because you mentioned that the file already imports the slog package.

[soypat]

Yes it was the go.mod file! I changed go 1.20 to go 1.21 and now intellisense works. It's odd because the program previously compiled fine and outputs slog records...

[adonovan]

Glad that worked!