Compile error navigation not working as advertised.

I'm attempting to use the Haskell compile error navigation features advertised in Sec. 13.1 of [this document](http://haskell.github.io/haskell-mode/manual/latest/Interactive-Haskell.html#Interactive-Haskell), but it's not working. I have two problems:

1. The advertised key bindings (i.e. - `M-n`, `M-p`, and `C-c M-p`) don't appear to be in force.
1. When I use the equivalent commands (via `M-x`), I'm told, "No more notes from Haskell compiler," despite the fact that there are some compile errors occurring.