inconsistent_language_version_override

Parts must have exactly the same language version override as the library.

The analyzer produces this diagnostic when a part file has a language version override comment that specifies a different language version than the one being used for the library to which the part belongs.

Given a part file named part.dart that contains the following:

// @dart = 2.14
part of 'test.dart';

The following code produces this diagnostic because the parts of a library must have the same language version as the defining compilation unit:

// @dart = 2.15
part 'part.dart';

Remove the language version override from the part file, so that it implicitly uses the same version as the defining compilation unit:

part of 'test.dart';

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