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panic when range-func return nil #69042

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dungdm93 opened this issue Aug 23, 2024 · 2 comments
Closed

panic when range-func return nil #69042

dungdm93 opened this issue Aug 23, 2024 · 2 comments

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@dungdm93
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dungdm93 commented Aug 23, 2024 •
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Go version

go version go1.23.0 linux/amd64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/dungdm93/.cache/go-build'
GOENV='/home/dungdm93/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/dungdm93/go/pkg/mod'
GONOPROXY='example.com/example/*'
GONOSUMDB='example.com/example/*'
GOOS='linux'
GOPATH='/home/dungdm93/go'
GOPRIVATE='example.com/example/*'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.23.0'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/dungdm93/.config/go/telemetry'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/dev/null'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build883436730=/tmp/go-build -gno-record-gcc-switches'

What did you do?

package main

import "iter"

func Seq() iter.Seq[string] {
	return nil
}

func main() {
	var l []any = nil
	for _, v := range l { // run normally
		println(v)
	}

	var m map[string]any = nil
	for k, v := range m { // run normally
		println(k, v)
	}

	for e := range Seq() { // panic: runtime error: nil pointer dereference
		println(e)
	}
}

What did you see happen?

panic: runtime error: nil pointer dereference when iter.Seq is nil

What did you expect to see?

Run successfully, as the same way as range over nil map and list
@gabyhelp
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(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)

@cuonglm
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cuonglm commented Aug 23, 2024

Duplicated of #65629

@cuonglm cuonglm closed this as completed Aug 23, 2024
This was referenced Feb 12, 2025
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@cuonglm @dungdm93 @gabyhelp