test/top_level/whitespace.unit

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>>> Force at least one newline between directives.
import 'a.dart';import 'b.dart';export 'c.dart';
<<<
import 'a.dart';
import 'b.dart';
export 'c.dart';
>>> Remove leading and trailing blank lines.



import 'a.dart';



<<<
import 'a.dart';
>>> Preserve up to one blank line between directives.
import 'a.dart';
import 'b.dart';

export 'c.dart';



export 'd.dart';
<<<
import 'a.dart';
import 'b.dart';

export 'c.dart';

export 'd.dart';