import_of_non_library

The imported library '{0}' can't have a part-of directive.

The analyzer produces this diagnostic when a part filePart fileA Dart source file that contains a `part of` directive. Learn more is imported into a library.

Given a part filePart fileA Dart source file that contains a `part of` directive. Learn more named part.dart containing the following:

part of lib;

The following code produces this diagnostic because imported files can't have a part-of directive:

library lib;
​
import 'part.dart';

Import the library that contains the part filePart fileA Dart source file that contains a `part of` directive. Learn more rather than the part filePart fileA Dart source file that contains a `part of` directive. Learn more itself.