#8809: Prettier error messages? -------------------------------------+------------------------------------- Reporter: joelteon | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.9 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): #8809,#10073,#10179,#12906 | Wiki Page: | -------------------------------------+------------------------------------- Comment (by mpickering): I'm a bit confused about the status of this ticket. The original poster suggests adding carets to error messages, this has now been done but the discussion in the ticket has moved all over the place. I want to bring order to the chaos! I think a new ticket which focuses just on the issue of adding semantic information to error messages should be created. There should also be (dare I say it...) a wikipage which outlines the suggested designs on this ticket. Richard, great that your student wants to work on this. Is that still the plan? Could she perhaps take care of creating the new ticket and the wikipage if she decides to take ownership of this. I entered this ticket with the intention to do so but don't want to step on her toes. When I last looked at this it seemed that the main problem was #10735 which talks about the problems with `pretty` which have so far put everyone off working on this (me included). The crux of the matter is that `pretty` isn't very efficient and we use it in the code generator. The solution here seems to be to use a different (simpler) pretty printing library for code generation as this shouldn't require complicated layout instructions such as hanging or nesting. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8809#comment:47 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler