% go get http://code.google.com/p/unicode/norm
package http:/code.google.com/p/unicode/norm: unrecognized import path
"http:/code.google.com/p/unicode/norm"
% 

The problem is that you should not specify an http: up front, but the error message
doesn't say that and confuses matters further by running the path through cleanname,
making it look like an erroneous path.

Fix the error message.