godebug run command not works

the source of hello.go is

package main

import (
    "fmt"
)

func main() {
    x := "Hello"
    _ = "breakpoint"
    y := "World"
    _ = "breakpoint"
    z := "Go"
    _ = "breakpoint"
    w := x + " " + y + " " + z
    _ = "breakpoint"
    fmt.Println(x, y, z)
    fmt.Println(w)
}

godebug run command shows error message like:

P:\go\src>godebug run hello.go
# command-line-arguments
C:\go\pkg\tool\windows_386\8l.exe: dwarf: unresolved references after first dwar
f info pass

however, the following command works well. (tested in git shell on win)

Home@HOME-PC /p/go/src
$ godebug output hello.go > hello.debug.go

Home@HOME-PC /p/go/src
$ go run hello.debug.go
-> _ = "breakpoint"
(godebug) l
...

... i mistype the command?

Start with the hello.go example and reproduce the failure from the reported Windows command prompt using godebug run hello.go. Compare its behavior with godebug output hello.go followed by go run hello.debug.go; done means the run command handles this example without the reported DWARF unresolved-reference error.