TortoiseSVN and code.google
The quick and dirty documentation found for instance here hints at one should write the project name and user name together with the https source path. So is not the case if one uses TortoiseSVN.
So the string
https://compulsorycat.googlecode.com/svn/trunk/ compulsorycat --username myusername@gmail.com
should really be
https://compulsorycat.googlecode.com/svn/trunk/
Not that hard to figure out really. But it took me a while. I even missed it at this helping side.
Just for information. Nothing fancy.