gopls: automated issue report (crash) - assertion failure in range statement checking logic

[fstiffo]

gopls version: v0.16.1/go1.22.5
gopls flags:
update flags: proxy
extension version: 0.42.0
environment: Visual Studio Code win32
initialization error: undefined
issue timestamp: Tue, 06 Aug 2024 16:35:15 GMT
restart history:
Tue, 06 Aug 2024 16:26:38 GMT: activation (enabled: true)

ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.

Describe what you observed.

panic: C:/Program   stmt.go:932: assertion failed

goroutine 771 [running]:
go/types.(*Checker).handleBailout(0xc000118800, 0xc001167898)
	C:/Program   check.go:367  0x88
panic({0xd5b920%3F, 0xc001149680%3F})
	C:/Program   panic.go:770  0x132
go/types.assert(0x0%3F)
	C:/Program   errors.go:28  0x54
go/types.(*Checker).rangeStmt(0xc000118800, 0x3, 0xc00054b500)
	C:/Program   stmt.go:932  0xe70
go/types.(*Checker).stmt(0xc000118800, 0x0, {0x11ddf80, 0xc00054b500})
	C:/Program   stmt.go:827  0xab9
go/types.(*Checker).stmtList(0xc000118800, 0x0, {0xc0005b0c60%3F, 0x0%3F, 0x30761e%3F})
	C:/Program   stmt.go:121  0x85
go/types.(*Checker).funcBody(0xc000118800, 0x11da370%3F, {0xc000381860%3F, 0x1877ca0%3F}, 0xc0006bfc80, 0xc00042c2d0, {0x0%3F, 0x0%3F})
	C:/Program   stmt.go:41  0x331
go/types.(*Checker).funcDecl.func1()
	C:/Program   decl.go:852  0x3a
go/types.(*Checker).processDelayed(0xc000118800, 0x0)
	C:/Program   check.go:467  0x162
go/types.(*Checker).checkFiles(0xc000118800, {0xc00069bb60, 0x1, 0x1})
	C:/Program   check.go:411  0x1cc
go/types.(*Checker).Files(...)
	C:/Program   check.go:372
golang.org/x/tools/gopls/internal/cache.(*typeCheckBatch).checkPackage(0xc00112e3c0, {0x11df228, 0xc000573710}, 0xc000e966c0)
	  check.go:1543  0xa25
golang.org/x/tools/gopls/internal/cache.(*typeCheckBatch).handleSyntaxPackage(0xc00112e3c0, {0x11df228, 0xc000573710}, 0x0, {0xc0003314a0, 0xa})
	  check.go:568  0x5e5
golang.org/x/tools/gopls/internal/cache.(*Snapshot).forEachPackageInternal.func2()
	  check.go:418  0x2b
golang.org/x/sync/errgroup.(*Group).Go.func1()
	  errgroup.go:78  0x56
created by golang.org/x/sync/errgroup.(*Group).Go in goroutine 62
	  errgroup.go:75  0x96

gopls stats -anon

{ "DirStats": { "Files": 8, "TestdataFiles": 0, "GoFiles": 2, "ModFiles": 1, "Dirs": 2 }, "GOARCH": "amd64", "GOOS": "windows", "GOPACKAGESDRIVER": "", "GOPLSCACHE": "", "GoVersion": "go1.22.5", "GoplsVersion": "v0.16.1", "InitialWorkspaceLoadDuration": "1.1098554s", "MemStats": { "HeapAlloc": 7790336, "HeapInUse": 15351808, "TotalAlloc": 103135280 }, "WorkspaceStats": { "Files": { "Total": 485, "Largest": 210104, "Errs": 0 }, "Views": [ { "GoCommandVersion": "go1.22.5", "AllPackages": { "Packages": 62, "LargestPackage": 148, "CompiledGoFiles": 483, "Modules": 1 }, "WorkspacePackages": { "Packages": 2, "LargestPackage": 2, "CompiledGoFiles": 3, "Modules": 1 }, "Diagnostics": 0 } ] } }

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[hyangah]

Dup of golang/go#68334

Looks like the fix will be available in go1.22.6 and go1.23.0. (not released yet)

If you build the gopls with go1.23rc2, does it fix the problem?

GOTOOLCHAIN=go1.23rc2 go install golang.org/x/tools/gopls@latest