Haskell in Emacs | Sam Ritchie
Keys bound:
C-c dshow error on current line as picked up by lintingC-c C-lload file into REPLC-c C-zjump to REPLC-c lrun through hs-lint for suggestionsC-c C-dlook up documentation of a function
However this is much better: ghc-mod which can be installed from the Debian repositories.