Iâm making a stream to write on a file using outputFile := FileLocator home / 'Desktop' / classBeingTranslated name , '.grace'. outputFile writeStreamDo: [ :s | ... ] Is that OK? When I do the above, in the writeStreamDo: block, s is bound to an instance of ZnCharacterWriteStream. But that class does nt understand many methods from WriteStream. For example, #contents is not understood, and nor is #ensureASpace. To put things another way: I wrote tests using a stream created with String streamContents: [ :s | ... ], and everything worked fine. Then, for production use, I switch to a stream created using outputFile writeStreamDo: [ :s | ... ] and everything breaks. I know that ZnCharacterWriteStream is fairly new. Am I doing something wrong, or is ZnCharacterWriteStream still under development? Andrew