Can't return an interface

[shykes]

The interface documentation shows how to define an interface and use it in arguments. But it doesn't show how to use the interface in the return value. I tried, but it doesn't seem to be possible.

It would be very useful to make this possible.

Example:

type Check interface {
 Pass() bool
 Details() string
}
 
type MyCheck struct {}
 
func (c *MyCheck) Pass() bool {
  return true
}
 
func (c *MyCheck) Details() string {
  return "my check always passes!"
}
 
type MyModule struct{}
 
func (m *MyModule) Check() Check {
 return new(MyCheck)
}

[sipsma]

This is due to the same problem described in this issue: #6366

The fix is essentially the same as what it would take to support self-API calls, so it's very much worth doing once there's bandwidth, given how much we'd get out of it.