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cmd/compile: internal compiler error: unexpected Interface for <nil> #22043

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eliasnaur opened this issue Sep 26, 2017 · 2 comments
Closed

cmd/compile: internal compiler error: unexpected Interface for <nil> #22043

eliasnaur opened this issue Sep 26, 2017 · 2 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.10

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@eliasnaur
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Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

Playground

Does this issue reproduce with the latest release?

Yes

What did you do?

Ran https://play.golang.org/p/0Cq3cm9-bo

What did you expect to see?

main.go:4:13: undefined: G

What did you see instead?

tmp/sandbox815323628/main.go:4:13: undefined: G
tmp/sandbox815323628/main.go:6:5: internal compiler error: unexpected Interface for <nil>

goroutine 1 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
	/usr/local/go/src/runtime/debug/stack.go:24 +0xa7
cmd/compile/internal/gc.Fatalf(0xb654a1, 0x1b, 0xc4202fc0e8, 0x1, 0x1)
	/usr/local/go/src/cmd/compile/internal/gc/subr.go:181 +0x230
cmd/compile/internal/gc.Val.Interface(0x0, 0x0, 0xc4202fc2e8, 0xc4202fc318)
	/usr/local/go/src/cmd/compile/internal/gc/const.go:99 +0x2df
cmd/compile/internal/gc.checkDupExprCases(0xc4202cee80, 0xc42000c548, 0x1, 0x1)
	/usr/local/go/src/cmd/compile/internal/gc/swt.go:628 +0x5ad
cmd/compile/internal/gc.typecheckswitch(0xc4202ceb80)
	/usr/local/go/src/cmd/compile/internal/gc/swt.go:210 +0x13a8
cmd/compile/internal/gc.typecheck1(0xc4202ceb80, 0x1, 0xc4202cea80)
	/usr/local/go/src/cmd/compile/internal/gc/typecheck.go:2157 +0xc871
cmd/compile/internal/gc.typecheck(0xc4202ceb80, 0x1, 0xc4202cea80)
	/usr/local/go/src/cmd/compile/internal/gc/typecheck.go:201 +0x764
cmd/compile/internal/gc.typecheckslice(0xc4202c7b40, 0x3, 0x4, 0x1)
	/usr/local/go/src/cmd/compile/internal/gc/typecheck.go:55 +0x54
cmd/compile/internal/gc.Main(0xb73f98)
	/usr/local/go/src/cmd/compile/internal/gc/main.go:480 +0x1fd0
main.main()
	/usr/local/go/src/cmd/compile/main.go:49 +0x95
@ianlancetaylor ianlancetaylor added this to the Go1.10 milestone Sep 26, 2017
@ianlancetaylor ianlancetaylor added the NeedsFix The path to resolution is known, but the work has not been done. label Sep 26, 2017
@mvdan
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mvdan commented Sep 26, 2017 •
edited

The good news is that this is already fixed: #21988

The bad news is that it's a regression in 1.9 not deemed important enough for a 1.9.x. And I would imagine the playground has to run stable, not tip.

@mdempsky
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Duplicate of #21988.

@golang golang locked and limited conversation to collaborators Sep 26, 2018
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.10
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@mdempsky @eliasnaur @ianlancetaylor @mvdan @gopherbot