Hi guys! I'm using AST really often, and recently stumbled on problem with copying an AST. It doesn't copy stuff related to computing sourceInterval of AST, and I need it to copy:) I know there are #deepCopy and #veryDeepCopy, but they are too heavy methods for AST, especially in my case, as I need to copy AST all the time. Earlier, I discussed this problem with Marcus Denker. He suggested to fix #copy of AST (to be more accurate #postCopy). If I want to copy stuff related to sourceInterval, I would have to implement #postCopy for each RBNode... differently. RBProgramNode>>#postCopy super postCopy. properties := properties copy So for each RBNode... it will be like: RBNode...>>#postCopy super postCopy. "here some different code each time" I'm just interested: What do you think about it? Thanks, Mark -- View this message in context: http://forum.world.st/AST-copy-behavior-tp4789447.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.