gopls: automated issue report (crash)

[DoisKoh]

gopls version: v0.16.1/go1.22.5
gopls flags:
update flags: proxy
extension version: 0.42.0
environment: Visual Studio Code darwin
initialization error: undefined
issue timestamp: Sun, 11 Aug 2024 16:25:29 GMT
restart history:
Sun, 11 Aug 2024 16:25:28 GMT: activation (enabled: true)

ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.

Describe what you observed.

Suddenly crashed when using the reflect package (trying to loop over NumFields())

Note: I was typing it out as ... range := t.NumFields() - as if I'm trying to loop over an int instead of an array. I know it's wrong but it shouldn't crash. Hope that helps.

panic:   stmt.go:932: assertion failed

goroutine 1507 [running]:
go/types.(*Checker).handleBailout(0x140002a8e00, 0x14002237878)
	  check.go:367  0x9c
panic({0x1053f73a0%3F, 0x14001700220%3F})
	  panic.go:770  0x124
go/types.assert(0x0%3F)
	  errors.go:28  0x60
go/types.(*Checker).rangeStmt(0x140002a8e00, 0x3, 0x14000d26960)
	  stmt.go:932  0xb58
go/types.(*Checker).stmt(0x140002a8e00, 0x0, {0x105580e80, 0x14000d26960})
	  stmt.go:827  0x874
go/types.(*Checker).stmtList(0x140002a8e00, 0x0, {0x14000145800%3F, 0x0%3F, 0x14001ac20f0%3F})
	  stmt.go:121  0x88
go/types.(*Checker).funcBody(0x140002a8e00, 0x10557e588%3F, {0x1400079a236%3F, 0x140000543f0%3F}, 0x140007d0980, 0x140003de9c0, {0x0%3F, 0x0%3F})
	  stmt.go:41  0x21c
go/types.(*Checker).funcDecl.func1()
	  decl.go:852  0x44
go/types.(*Checker).processDelayed(0x140002a8e00, 0x0)
	  check.go:467  0x12c
go/types.(*Checker).checkFiles(0x140002a8e00, {0x14000032820, 0x3, 0x4})
	  check.go:411  0x188
go/types.(*Checker).Files(...)
	  check.go:372
golang.org/x/tools/gopls/internal/cache.(*typeCheckBatch).checkPackage(0x140020819e0, {0x105582168, 0x14001948e10}, 0x14001119200)
	  check.go:1543  0x788
golang.org/x/tools/gopls/internal/cache.(*typeCheckBatch).handleSyntaxPackage(0x140020819e0, {0x105582168, 0x14001948e10}, 0x0, {0x14000299800, 0x31})
	  check.go:568  0x534
golang.org/x/tools/gopls/internal/cache.(*Snapshot).forEachPackageInternal.func2()
	  check.go:418  0x34
golang.org/x/sync/errgroup.(*Group).Go.func1()
	  errgroup.go:78  0x58
created by golang.org/x/sync/errgroup.(*Group).Go in goroutine 148
	  errgroup.go:75  0x98

gopls stats -anon

gopls stats -anon failed after 290 ms. Please check if gopls is killed by OS.

[findleyr]

Thanks. This is a dupe of golang/go#68334, a regression in the go type checking in 1.22.5. Should be fixed by 1.22.6 (or 1.23.0!).