Improve error messages as described in a list discussion
Improve error messages as described in a list discussion

https://groups.google.com/forum/#!topic/elm-discuss/X4V4edxeFKI

deadfoxygrandpa/Elm,Axure/elm-compiler,pairyo/elm-compiler,5outh/Elm,JoeyEremondi/elm-pattern-effects,mgold/Elm,laszlopandy/elm-compiler