"Conal Elliott"
Thanks for questioning my assumption. hscolour is getting -anchor, after all. It's somehow failing to make anchors some classes.
There was a bug in hscolour-1.8 whereby many top-level definitions failed to get an anchor - it is fixed in 1.9. If you have a reproducible case where it still fails, please let me know. However, there is also a more long-standing issue with class methods, which never get an anchor. This is primarily because they are tricky to recognise, purely lexically, in a reliable way. In any case, it is rare for the source defn of a class method to contain any more information than the generated haddock (because the method only has code if there is a default defn, and in most cases, you can't navigate to the instance code). Regards, Malcolm