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len(l) > 0 && l[0] == nil panic #66930

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hrz123 opened this issue Apr 19, 2024 · 1 comment
Closed

len(l) > 0 && l[0] == nil panic #66930

hrz123 opened this issue Apr 19, 2024 · 1 comment

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@hrz123
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hrz123 commented Apr 19, 2024 •
edited

Go version

go1.18

Output of go env in your module/workspace:

GO111MODULE="on"
GOARCH="arm64"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOOS="darwin"
GOSUMDB="sum.golang.google.cn"
GOTMPDIR=""
GOVCS=""
GOVERSION="go1.18.3"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
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 -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/84/f6ytzpl10072g4x4pw8q98bc0000gn/T/go-build581550541=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

l is of type []interface{}
returned by following func

func (cmd *SliceCmd) Result() ([]interface{}, error) {
	return cmd.val, cmd.err
}

What did you see happen?

panic

What did you expect to see?

it shouldn't panic in my opinion. What's the root cause and how we can fix it.
@ianlancetaylor
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We don't use the issue tracker for questions. Please ask on a forum instead. See https://go.dev/wiki/Questions. Thanks.

Also, it's impossible to answer your question with the information you've provided. When you ask on a forum, please show a complete self-contained example, and please show the panic output that you are getting.

@ianlancetaylor ianlancetaylor closed this as not planned Won't fix, can't repro, duplicate, stale Apr 19, 2024
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@ianlancetaylor @hrz123