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cmd/compile: ICE instantiating a generic type B in type A[T] struct{}; type B[T] A[[]T] with error #56626

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twz123 opened this issue Nov 7, 2022 · 2 comments
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cmd/compile: ICE instantiating a generic type B in type A[T] struct{}; type B[T] A[[]T] with error #56626

twz123 opened this issue Nov 7, 2022 · 2 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge generics Issue is related to generics NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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@twz123
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twz123 commented Nov 7, 2022

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

$ go version
go version go1.19.3 linux/amd64

Does this issue reproduce with the latest release?

Yes.

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN="/home/user/.local/share/go/bin"
GOCACHE="/home/user/.cache/go/cache"
GOENV="/home/user/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/user/.cache/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/user/.local/share/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/nix/store/mpbwhnfs6ciqrnckyn33z2yljsgpg416-go-1.19.3/share/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/nix/store/mpbwhnfs6ciqrnckyn33z2yljsgpg416-go-1.19.3/share/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.19.3"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/user/boom/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3668342732=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I've put together the following program: https://go.dev/play/p/J8PRzNRJoUi

What did you expect to see?

As far as my Go knowledge goes, I think the above program is valid. I expected to see the program compile and run with no output. If I am wrong and the program is not okay, I would have expected a proper compiler error to be displayed that indicates the problem(s).

What did you see instead?

An internal compiler error. Running this on the Go Playground gives me:

# play.ground/foo
<autogenerated>:1: internal compiler error: missing pkg

Please file a bug report including a short program that triggers the error.
https://go.dev/issue/new

Go build failed.

My observations

  • Using any other type than error in x := SlicedInner[error]{} on line 27 makes it compile. I tried other interfaces (including any), primitives, struct pointers, ...
  • Actually using the return value of CallSomeFuncOnInner (i.e. by uncommenting the fmt.Println) fixes it, too.
@mknyszek mknyszek changed the title Internal compiler error with newtypes over generic arrays when using the error type cmd/compile: ICE instantiating a generic type B in type A[T] struct{}; type B[T] A[[]T] with error Nov 7, 2022
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Nov 7, 2022
@mknyszek mknyszek added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. generics Issue is related to generics labels Nov 7, 2022
@mknyszek mknyszek added this to the Backlog milestone Nov 7, 2022
@mknyszek
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mknyszek commented Nov 7, 2022

CC @golang/compiler

@cuonglm
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cuonglm commented Nov 7, 2022

Duplicated of #55101

@cuonglm cuonglm closed this as completed Nov 7, 2022
@golang golang locked and limited conversation to collaborators Nov 7, 2023
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