40 columns                              |
>>> Insert blank between library and import.
library foo;
import 'a.dart';
<<<
library foo;

import 'a.dart';
>>> Insert blank between library and export.
library foo;
export 'a.dart';
<<<
library foo;

export 'a.dart';
>>> Insert blank between library and part.
library foo;
part 'a.dart';
<<<
library foo;

part 'a.dart';
>>> Collapse extra newlines between declarations.



class A {}



class B = Base with Mixin;



var c = 1;


d() {}


<<<
class A {}

class B = Base with Mixin;

var c = 1;

d() {}