Use struct instead of constructed string as key
Use struct instead of constructed string as key

This code tests correct but fails in a real world situation due to a
problem with the runtime hashmap code. Keep and wait until that issue is
resolved.

http://code.google.com/p/go/issues/detail?id=3695

brentp/biogo,mnsmar/biogo,biogo/biogo,brentp/biogo,mnsmar/biogo,biogo/biogo