On Sat, Jul 5, 2025 at 8:24 AM Ge <evergon...@gmail.com> wrote:
>
> As follows showing, when `-N` is enabled with compiler, it gives the
> expected output.
> ```
> ➜ grd more nf2.go
> package main
>
> import "os"
>
> func main() {
> f, err := os.Open("nonExistFile")
> fname := f.Name()
> if err != nil {
> println("failed to open file, Error:", err.Error())
> return
> }
>
> println("filename:", fname)
> }
> ➜ grd go run nf2.go
> failed to open file, Error: open nonExistFile: no such file or directory
>
> ➜ grd go run -gcflags="-N" nf2.go
> panic: runtime error: invalid memory address or nil pointer dereference
> [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x4782e3]
>
> goroutine 1 [running]:
> os.(*File).Name(...)
> /usr/local/go/src/os/file.go:62
> main.main()
> /root/grd/nf2.go:7 +0x123
> exit status 2
>
> ➜ grd go version
> go version go1.24.4 linux/amd64
> ```
This may be https://go.dev/issue/72860. In any case, it works
correctly (that is, it panics) on HEAD and the upcoming Go 1.25
release.
Ian
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