Cannot export a generic function

[ymzuiku]

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

$ go version

go version go1.17 darwin/amd64

Does this issue reproduce with the latest release?

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

go env Output

$ go env
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/pillar/Library/Caches/go-build"
GOENV="/Users/pillar/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/pillar/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/pillar/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.17"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Applications/source/work/go-github/go-generic-learn/go.mod"
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 x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/69/y88g1ft14_g35vl07y3dr6200000gn/T/go-build279161576=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

main.go:

package main

import "go-generic-learn/pkg"

func main() {
	pkg.Say([]string{"Hello, ", "world\n"})
}

pkg/pkg.go:

package pkg

import "fmt"

func Say[T any](s []T) {
	for _, v := range s {
	 fmt.Print(v)
	}
 }

go run -gcflags=all=-G=3 main.go

What did you expect to see?

print: Hello, world

What did you see instead?

# go-generic-learn/pkg
pkg/pkg.go:5:6: internal compiler error: Cannot export a generic function (yet): Say

Please file a bug report including a short program that triggers the error.
https://golang.org/issue/new

[cristaloleg]

Looks like here is the answer Cannot export a generic function (yet). yet generic are not released, support is limited.

[cuonglm]

@ymzuiku generic is not fully supported in go1.17, if you want to try, please use gotip.

See similar: #43931 (comment)

[jhunters]

could visit this. now 1.17 not yet support use generics at public function
https://preslav.me/2021/08/17/how-to-use-generics-in-golang-starting-from-go1-17/