Date: 2009-08-05 03:55:59 GMT (4 hours and 2 minutes ago) Hi All, in ParseNode>>printCommentOn: there is the most perplexing destructive modification of a comment on printing: printCommentOn: aStream indent: indent | thisComment | self comment == nil ifTrue: [^ self]. 1 to: self comment size do: [:index | index > 1 ifTrue: [aStream crtab: indent]. aStream nextPut: $". thisComment := self comment at: index. self printSingleComment: thisComment on: aStream indent: indent. aStream nextPut: $"]. !! self comment: nil The result is that a parse tree can only be printed once before it prints without comments. Can anyone justify this? I would like to remove it; it makes no sense to me. best Eliot