[unscaled]

No they're not. io.Reader and sync.Mutex do not embed the same type and do not have conflicting methods with the same name.

This is how a diamond looks like:

  type Base struct {
    Foo int32
  }

  type Child1 struct {
    Base
  }

  type Child2 struct {
    Base
  }

  type Diamond struct {
    Child1
    Child2
  }

  func (c *Child1) DoSomething() {
    fmt.Println(c.Foo)
  }

  func (c *Child2) DoSomething() {
    fmt.Println(c.Foo)
  }

  func main() {
    c := Diamond { }
    c.Foo = 42       // Doesn't Compile
    c.Child1.Foo = 10
    c.Child2.Foo = 20
    c.DoSomething()  // Doesn't Compile
  }