code: func (self *Scheme) fromScope(s conversion.Scope) (inVersion, outVersion string, scheme *Scheme) {
  	scheme = self
  	inVersion = s.Meta().SrcVersion
  	outVersion = s.Meta().DestVersion
  	return inVersion, outVersion, scheme
  }
docs: // fromScope gets the input version, desired output version, and desired Scheme
  // from a conversion.Scope.