by czapkofan:

1. What is a short input program that triggers the error?

package main

import (
    "fmt"
    "unsafe"
)

type example struct {
    port   uint16
}

func main() {
    foo := new(example)
    fmt.Println("offset=", unsafe.Offsetof(foo.port))
}


2. What is the full compiler output?

<epoch>: internal compiler error: dowidth any

3. What version of the compiler are you using?  (Run it with the -V flag.)

8g version 5612+

4. Notes:
- Go changeset: 443fb42ed60e
- Go compiled on Windows