I was looking for a procedure that returns the length of the spine of a dotted list, and saw that length+ will do this. But according to the SRFI it’s not a valid argument. And a brief search through the archives reveals a message from Olin stating that it should signal an error if given such an argument, as most list procedures do.
There are several ways to resolve this, including doing nothing. I don’t have a strong opinion on the right action, though obviously in my current situation I’d like it to work on dotted lists. :)
