reflect: Value.Comparable returns false for nil interface value #65718
Description
Go version
go1.22.0.linux-amd64
Output of go env in your module/workspace:
GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/user/.cache/go-build'
GOENV='/home/user/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/user/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/user/go'
GOPRIVATE=''
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='go1.22.0'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/home/user/myproject/go.mod'
GOWORK='/home/user/myproject/go.work'
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-build2649934156=/tmp/go-build -gno-record-gcc-switches'What did you do?
I'm trying to check in the runtime if I can use a value as a key in a map. I'm using reflect.Value.Comparable() to determine whether a value is comparable or not. Example: https://go.dev/play/p/3p7t501BqSU
What did you see happen?
It says my struct isn't comparable, but I still can use it as a key in a map or compare it with other structs.
What did you expect to see?
If this is something that's intended, then at least name of reflect.Value.Comparable() function could be more accurate. Otherwise, I expect this function to return true for any type that can be compared or used as a key for a map.