Haskell in Emacs | Sam Ritchie
Keys bound:
C-c d
show error on current line as picked up by lintingC-c C-l
load file into REPLC-c C-z
jump to REPLC-c l
run through hs-lint for suggestionsC-c C-d
look up documentation of a function
However this is much better: ghc-mod which can be installed from the Debian repositories.