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interface{} == nil comparison returns false instead of true #28241

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ston1th opened this issue Oct 16, 2018 · 2 comments
Closed

interface{} == nil comparison returns false instead of true #28241

ston1th opened this issue Oct 16, 2018 · 2 comments
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@ston1th
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ston1th commented Oct 16, 2018

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

go version go1.11.1 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=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="0"
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/bwmjw0Rt_wk

What did you expect to see?

n2 == nil should be true (reflect.ValueOf(n2).IsNil() reports true correctly)

What did you see instead?

n2 == nil is false
@deanveloper
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deanveloper commented Oct 16, 2018 •
edited

Intended behavior. An interface consists of two "fields", a type, and a pointer to the value.

In order for an interface to == nil, both the type and value need to be nil.

https://golang.org/doc/faq#nil_error

@ston1th
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ston1th commented Oct 16, 2018

Ahh, thanks for clearing things up.

@ston1th ston1th closed this as completed Oct 16, 2018
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@deanveloper @gopherbot @ston1th