cmd/go: internal compiler error: panic: runtime error: index out of range [0] with length 0 on compiling generics code

[victpork]

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

1.18.0

$ go version
go1.18 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=""

GOCACHE="/home/runner/.cache/go-build"

GOENV="/home/runner/.config/go/env"

GOEXE=""

GOEXPERIMENT=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="linux"

GOINSECURE=""

GOMODCACHE="/home/runner/go/pkg/mod"

GONOPROXY=""

GONOSUMDB=""

GOOS="linux"

GOPATH="/home/runner/go"

GOPRIVATE=""

GOPROXY="https://proxy.golang.org,direct"

GOROOT="/opt/hostedtoolcache/go/1.18.0/x64"

GOSUMDB="sum.golang.org"

GOTMPDIR=""

GOTOOLDIR="/opt/hostedtoolcache/go/1.18.0/x64/pkg/tool/linux_amd64"

GOVCS=""

GOVERSION="go1.18"

GCCGO="gccgo"

GOAMD64="v1"

AR="ar"

CC="gcc"

CXX="g++"

CGO_ENABLED="1"

GOMOD="/home/runner/work/go-radix/go-radix/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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3140959091=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Trying to convert https://github.com/armon/go-radix into version supporting generics. Changed all interface{} types into generics, adding a generic "return nil" function.

https://go.dev/play/p/alc4b8f2kaj or https://github.com/victpork/go-radix

What did you expect to see?

Expecting to either compile successfully or compiler complains code syntax instead of crashes.

What did you see instead?

./prog.go:124:11: internal compiler error: panic: runtime error: index out of range [0] with length 0

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

[ALTree]

Thanks for reporting this, I think that's the same issue described in #51765 (stacktrace looks similar). I'm closing here as a dup.