checkResolved method
      
void
checkResolved()
      
     
    
Throws an exception if resolve hasn't been called yet.
Implementation
void checkResolved() {
  if (!_resolved) {
    throw StateError('message not resolved: $fullName');
  }
}Throws an exception if resolve hasn't been called yet.
void checkResolved() {
  if (!_resolved) {
    throw StateError('message not resolved: $fullName');
  }
}