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otaxhu opened this issue Oct 20, 2024 · 3 comments
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encoding/xml: panic: reflect: Index out of range #69949

otaxhu opened this issue Oct 20, 2024 · 3 comments

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@otaxhu
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otaxhu commented Oct 20, 2024

Go version

go version go1.23.2 linux/amd64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/albian/.cache/go-build'
GOENV='/home/albian/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/albian/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/albian/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/opt/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.23.2'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/albian/.config/go/telemetry'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/home/albian/dev/problem/go.mod'
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-build3479115519=/tmp/go-build -gno-record-gcc-switches'

What did you do?

Tried to unmarshal a xml document to a struct

Somehow I cannot reproduce the panic with a minimal reproducible program, so I'm gonna copy and paste part of the original code:
https://go.dev/play/p/8fc1X8qJOXt

What did you see happen?

Got following panic message:

panic: reflect: Field index out of range

What did you expect to see?

Unmarshal the document:

<problem xmlns="urn:whatever">
</problem>

To the struct:

struct {
    RegisteredProblem

    Custom string `xml:"custom"`
}

And not to panic.
@gabyhelp
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Related Issues and Documentation

(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)

@otaxhu
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otaxhu commented Oct 20, 2024

Issue #16497 seems to have the same problem that I have, It worked flipping the XMLName field to be the first instead of the last.

Working example https://go.dev/play/p/EMAgchRIE4y

@seankhliao
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Duplicate of #16497

@seankhliao seankhliao marked this as a duplicate of #16497 Oct 20, 2024
@seankhliao seankhliao closed this as not planned Won't fix, can't repro, duplicate, stale Oct 20, 2024
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3 participants
@seankhliao @otaxhu @gabyhelp