Go Diamond Problem

shred.go

package main

// Seems like this could be problematic when extending a type in a 3rd party module...

import (
    "fmt"
)

type Shredder interface {
    Shred()
}

type Biram struct{}
type LeftLane struct{}

func (s *Biram) Shred() {
    fmt.Println("Chicken!")
}

func (s *LeftLane) Shred() {
    fmt.Println("Shine!")
}

type BillHilly struct {
    Biram
    LeftLane
}

func ShredRealLoud(s Shredder) {
    fmt.Println("!!!!!!!!!!!!!")
    s.Shred()
    fmt.Println("!!!!!!!!!!!!!")
}

func main() {
    bh := &BillHilly{}
    bh.Shred() // ./shred.go:35: ambiguous selector bh.Shred
    ShredRealLoud(bh) // ./shred.go:36: BillHilly.Shred is ambiguous
                      // ./shred.go:36: cannot use bh (type BillHilly) as type Shredder in function argument:
	              //     BillHilly does not implement Shredder (missing Shred method)

}

...eh? that's the expected behavior. bh has no Shred() method; but bh.Biram.Shred() and bh.LeftLane.Shred() exist. You would have to func (b *BillHilly) Shred() { b.Biram.Shred() } to make that work.

Sure, but it does compile if you comment out either line 25 or 26. I know there's nothing wrong with this behavior, I just found it interesting.