Dumper listItem looks wrong

[Ducasse]

visitListItem: anItem

	self flag: #arg.
	self 
		element: anItem 
		during: [
			anItem children 
				do: [ :each | each accept: self ]
				separatedBy: [ ''.	'' ] ]

managing a list is ok but at least we should open it and close it and this is clearly not the case.

• Should write a test showing the problem
• Fix it.