dart:core UnimplementedError class   Thrown by operations that have not been implemented yet. This Error is thrown by unfinished code that hasn't yet implemented all the features it needs. If the class does not intend to implement the feature, it should throw an UnsupportedError instead. This error is only intended for use during development.  Inheritance   Object Error UnimplementedError   Implemented types   UnsupportedError    Constructors   UnimplementedError([String? message])   Properties   hashCode → int read-only, inherited
  The hash code for this object.    message → String? final
  runtimeType → Type read-only, inherited
  A representation of the runtime type of the object.    stackTrace → StackTrace? read-only, inherited
  The stack trace at the point where this error was first thrown.    Methods   noSuchMethod(Invocation invocation) → dynamic  inherited
  Invoked when a non-existent method or property is accessed.    toString() → String override
  A string representation of this object.    Operators   operator ==(Object other) → bool inherited
  The equality operator.   

    
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