x/tools/gopls: automated issue report (crash)

[mjmac]

gopls version: v0.6.4
gopls flags:
extension version: 0.22.1
environment: Visual Studio Code linux
initialization error: undefined
manual restart count: 0
total start count: 1

Was working in a file that uses cgo, started typing the name of a C function and I guess gopls crashed.

panic: unreachable

goroutine 6510 [running]:
go/types.(*Checker).handleBailout(0xc00253fc20, 0xc00367f9f0)
	  check.go:244  0x98
panic(0xca9380, 0xf063e0)
	  panic.go:969  0x1b9
go/types.unreachable(...)
	  errors.go:24
go/types.(*Checker).assignment(0xc00253fc20, 0xc007100680, 0xf1f240, 0xc00627ac60, 0xdea16c, 0xa)
	  assignments.go:28  0x78f
go/types.(*Checker).initVar(0xc00253fc20, 0xc00d39ae60, 0xc007100680, 0xdea16c, 0xa, 0x7f78c1addd00, 0x8)
	  assignments.go:124  0x148
go/types.(*Checker).initVars(0xc00253fc20, 0xc00d398208, 0x1, 0x1, 0xc007ed7e70, 0x1, 0x1, 0x0)
	  assignments.go:247  0x599
go/types.(*Checker).shortVarDecl(0xc00253fc20, 0xdc850c, 0xc007ed7e60, 0x1, 0x1, 0xc007ed7e70, 0x1, 0x1)
	  assignments.go:322  0x28c
go/types.(*Checker).stmt(0xc00253fc20, 0x0, 0xf2ae60, 0xc003bbb0c0)
	  stmt.go:398  0x36aa
go/types.(*Checker).stmtList(0xc00253fc20, 0x0, 0xc002282e00, 0x7, 0x8)
	  stmt.go:120  0xd1
go/types.(*Checker).funcBody(0xc00253fc20, 0xc0031ddda0, 0xc0047967ec, 0x4, 0xc006166540, 0xc0009fdcb0, 0x0, 0x0)
	  stmt.go:42  0x21c
go/types.(*Checker).funcDecl.func1()
	  decl.go:662  0x67
go/types.(*Checker).processDelayed(0xc00253fc20, 0x0)
	  check.go:290  0x3e
go/types.(*Checker).checkFiles(0xc00253fc20, 0xc006922540, 0x8, 0x8, 0x0, 0x0)
	  check.go:266  0xd0
go/types.(*Checker).Files(...)
	  check.go:249
golang.org/x/tools/internal/lsp/cache.typeCheck(0xf2d8e0, 0xc006922280, 0xc0000fe540, 0xc001f7d1e0, 0x2, 0xc007ebcf30, 0x0, 0x0, 0x0)
	  check.go:431  0x1273
golang.org/x/tools/internal/lsp/cache.(*snapshot).buildPackageHandle.func1(0xf2d8e0, 0xc006922280, 0xf19d00, 0xc0000fe540, 0x0, 0x1)
	  check.go:97  0x1bc
golang.org/x/tools/internal/memoize.(*Handle).run.func1(0xc007cb18b0, 0xf2d8e0, 0xc006922280, 0xc007cd6080, 0xf19d00, 0xc0000fe540, 0xc008d34a80)
	  memoize.go:322  0xa8
created by golang.org/x/tools/internal/memoize.(*Handle).run
	  memoize.go:315  0x185
[Error - 5:04:53 PM] 

[hyangah]

@mjmac Thanks for the report and stack trace. Transferring to the gopls issue tracker.
Is it reproducible with the latest gopls (v0.6.5 is the latest, and v0.6.6-pre.1 is currently out for testing)?
And what's the go version you are using?

[stamblerre]

/cc @findleyr for type-checker

[findleyr]

/cc @griesemer as well.

Based on line numbers, this is go1.15 or earlier (in other words, not a new regression in 1.16). From the description and panic site, I'd guess the assignment operand was a cgofunc.

[findleyr]

I'm going to close this as a dupe of #44397, which was more recently filed but has more information.