Conversion of a pointer type to source type

[gucio321]

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

$ go version
go version go1.21.3 linux/amd64

Does this issue reproduce with the latest release?

yes

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

go env Output

$ go env
GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/me/.cache/go-build'
GOENV='/home/me/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/me/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/me/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='go1.21.3'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/dev/null'
GOWORK=''
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-build1650394567=/tmp/go-build -gno-record-gcc-switches'

What did you do?

I wrot a simple code:

package main

import "fmt"

type (
        foo int
        bar *foo
)

func main() {
        var y bar
        fmt.Printf("%T\n", y)
        fmt.Printf("%T\n", (*int)(y)) // <- Why this doesn't work?
        fmt.Printf("%T\n", (*int)((*foo)(y)))
}

What did you expect to see?

The code should compile

What did you see instead?

./main.go:13:28: cannot convert y (variable of type bar) to type *int

[Jorropo]

I'm pretty sure https://go.dev/doc/faq#convert_slice_with_same_underlying_type applies here even tho you are not using slices.

---

I feel this also applies https://github.com/golang/go/wiki/Questions

Unlike many projects, the Go project does not use GitHub Issues for general discussion or asking questions.

🙂

[gucio321]

I see, thanks for your answer. I tought it is a bug and should be fixed (as these are not slices)