compiler: dead code and labels cause compilation failure

[Bios-Marcel]

Go version

go version go1.22.1 windows/amd64

Output of go env in your module/workspace:

set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\marce\AppData\Local\go-build
set GOENV=C:\Users\marce\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\marce\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\marce\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Users\marce\scoop\apps\go\current
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLCHAIN=auto
set GOTOOLDIR=C:\Users\marce\scoop\apps\go\current\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.22.1
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\Users\marce\code\spoon\compilerbug\go.mod
set GOWORK=
set CGO_CFLAGS=-O2 -g
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-O2 -g
set CGO_FFLAGS=-O2 -g
set CGO_LDFLAGS=-O2 -g
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=C:\Users\marce\AppData\Local\Temp\go-build2412120114=/tmp/go-build -gno-record-gcc-switches

What did you do?

I created the following main file:

package main

import (
	"fmt"
	"path/filepath"
)

func main() {
	fmt.Println("Start")
	call("")
	fmt.Println("End")
}

func call(parameter string) error {
	return nil

	ext := filepath.Join(parameter, "lol")
	if parameter != "" {
		goto LABEL
	}

LABEL:
	if ext != "" {
		fmt.Println("Label")
	}
	return nil
}

It contains unreachable code, but the compiler does not correctly interpret this and trips up instead.

What did you see happen?

PS C:\Users\marce\code\spoon\compilerbug> go run .
# bug
CLOSURE [C:\Users\marce\code\spoon\compilerbug\main.go:23:5:var ext string]
<unknown line number>: internal compiler error: assertion failed

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

What did you expect to see?

Not an internal compiler error, but the normal behaviour.

[randall77]

Possibly this is #65593, which is fixed in 1.22.2. Can you try that release?

[qiulaidongfeng]

Possibly this is #65593, which is fixed in 1.22.2. Can you try that release?

I tried, go1.22.2 has no ICE.

[Bios-Marcel]

Yup, seems fine on 1.22.2! Sorry for the bother.