gopls: automated issue report (crash)

[nicolasparada]

gopls version: v0.8.1 (go1.18)
gopls flags:
update flags: proxy
extension version: 0.32.0
go version: 1.18
environment: Visual Studio Code darwin
initialization error: undefined
issue timestamp: Wed, 16 Mar 2022 18:06:38 GMT
restart history:
Wed, 16 Mar 2022 18:06:29 GMT: activation (enabled: true)

ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.

Describe what you observed.

panic: runtime error: slice bounds out of range [482:37]

goroutine 3437 [running]:
golang.org/x/tools/internal/lsp/template.(*Parsed).RuneCount(0x1400216cc80%3F, 0x26a%3F, 0x0%3F, 0x280%3F)
	  parse.go:301  0xd0
golang.org/x/tools/internal/lsp/template.SemanticTokens({0x100fd8548%3F, 0x14006cb4000%3F}, {0x100fdfd28%3F, 0x14000346240%3F}, {0x14000338690%3F, 0x0%3F}, 0x14000859558, 0x14000859548)
	  implementations.go:169  0x2f0
golang.org/x/tools/internal/lsp.(*Server).computeSemanticTokens(0x14000000360, {0x100fd8548%3F, 0x14006cb4000}, {{0x1400215bc20%3F, 0x1%3F}}, 0x0)
	  semantic.go:89  0x714
golang.org/x/tools/internal/lsp.(*Server).semanticTokensFull(...)
	  semantic.go:40
golang.org/x/tools/internal/lsp.(*Server).SemanticTokensFull(0x14006db1140%3F, {0x100fd8548%3F, 0x14006cb4000%3F}, 0x100e98fa0%3F)
	  server_gen.go:240  0x38
golang.org/x/tools/internal/lsp/protocol.serverDispatch({0x100fd8548, 0x14006cb4000}, {0x100fe23d8, 0x14000000360}, 0x14002fa7830, {0x100fd87b0, 0x14003bf5f80})
	  tsserver.go:304  0x394c
golang.org/x/tools/internal/lsp/protocol.ServerHandler.func1({0x100fd8548, 0x14006cb4000}, 0x14002fa7830, {0x100fd87b0, 0x14003bf5f80})
	  protocol.go:154  0x70
golang.org/x/tools/internal/lsp/lsprpc.handshaker.func1({0x100fd8548, 0x14006cb4000}, 0x14002fa7830, {0x100fd87b0%3F, 0x14003bf5f80%3F})
	  lsprpc.go:506  0x788
golang.org/x/tools/internal/jsonrpc2.MustReplyHandler.func1({0x100fd8548, 0x14006cb4000}, 0x14002d40990, {0x100fd87b0%3F, 0x14003bf5f80%3F})
	  handler.go:35  0xf4
golang.org/x/tools/internal/jsonrpc2.AsyncHandler.func1.2()
	  handler.go:103  0x90
created by golang.org/x/tools/internal/jsonrpc2.AsyncHandler.func1
	  handler.go:100  0x1dc
[Error - 3:06:34 PM] 

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[nicolasparada]

Additional info:
I have this setting enabled:

{
    "gopls": {
        "ui.semanticTokens": true
    }
}

[findleyr]

@nicolasparada could you share anything about the code you were editing when this happened?

(things like non-ascii characters might be relevant)

[nicolasparada]

It was a simple template file (.tmpl). Let me try to replicate it.

[nicolasparada]

I uninstalled the extension, reinstalled it, and reinstalled the go tools, and disabled semanticTokens.
And it has been working fine now.

Enabling semanticTokens now doesn't give me any error. Cannot replicate so far.

[suzmue]

Closing because the upstream issue is now fixed golang/go#51731. It will be in the next gopls release.