Result<T, E>.ok  constructor 
      const
      Result<T, E>.ok (
    
    
- T data
 
Implementation
const Result.ok(T data)
    : isOk = true,
      _data = data,
      _error = null;
const Result.ok(T data)
    : isOk = true,
      _data = data,
      _error = null;