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
```
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