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Nil pointer to struct implementing error interface is nil, but error(x) == nil returns false #24947

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wallnutkraken opened this issue Apr 19, 2018 · 2 comments
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Nil pointer to struct implementing error interface is nil, but error(x) == nil returns false #24947

wallnutkraken opened this issue Apr 19, 2018 · 2 comments
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@wallnutkraken
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wallnutkraken commented Apr 19, 2018 •
edited

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

go version go1.9.4 linux/amd64

Does this issue reproduce with the latest release?

Yes.

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/gnugat/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build810068483=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"

What did you do?

https://play.golang.org/p/x5Ix8wmC0Oj

What did you expect to see?

errImpl is nil
error(errImpl) is nil

What did you see instead?

errImpl is nil
ErrImpl value: <nil>
@wallnutkraken wallnutkraken changed the title Nil pointer to struct implementing error interface is nil, but x == nil returns false Nil pointer to struct implementing error interface is nil, but error(x) == nil returns false Apr 19, 2018
@go101
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go101 commented Apr 19, 2018

This is not a bug. Please read https://go101.org/article/unofficial-faq.html#nil-equality for explanations.

@ALTree
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ALTree commented Apr 19, 2018

Also Why is my nil error value not equal to nil?

Closing this, since it's not a bug.

@ALTree ALTree closed this as completed Apr 19, 2018
@ianlancetaylor ianlancetaylor mentioned this issue Apr 19, 2018
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@golang golang locked and limited conversation to collaborators Apr 19, 2019
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@ALTree @gopherbot @wallnutkraken @go101