Right now, there is: TxBasicSpan>>#isAtEnd ^ false and TxEndSpan>>#isAtEnd ^ true However, there are cases were a list of spans has no end marker e.g. the argument to #insert: I'm thinking of changing to: TxBasicSpan>>#isAtEnd ^ self next == self. This will allow changing e.g. the following slightly opaque loop condition: [ span next == span ] whileFalse: [ span := span next ]. to: [ span isAtEnd ] whileFalse: [ span := span next ]. All tests pass with this change, but I'm still very much beginning learning Tx, so I wanted to run it by everyone to see if I'm missing something... ----- Cheers, Sean -- View this message in context: http://forum.world.st/TxSpan-isAtEnd-tp4824134.html Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.