While I was doing some porting work between Squeak and VA Smalltalk, I
found out that trying to fileOut category '-- all --' will result in nothing.

The attached method will correctly file out all the selectors for the '--
all --' category.
Content-Type: application/octet-stream; 
name="ClassDescription-fileOutCategoryonmoveSourcetoFile.st"
Content-Disposition: attachment; 
filename="ClassDescription-fileOutCategoryonmoveSourcetoFile.st"

Attachment converted: Anon:ClassDescription-fileOutCategor 
(????/----) (00014CF0)

-- Mark