doc_import_cannot_have_prefix

Doc imports can't have prefixes.

The analyzer produces this diagnostic when a documentation import has a prefix.

Using prefixes isn't supported for documentation imports.

The following code produces this diagnostic because the documentation import declares a prefix:

/// @docImport 'package:meta/meta.dart' as a;
library;

Remove the prefix:

/// @docImport 'package:meta/meta.dart';
library;