#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: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by bgamari): I should note that adding an index and `Monad` instance to `Doc` isn't entirely trivial. I believe it is possible (and have a patch with much of the work) but I haven't yet proven to myself that it will preserve the invariants that the Hughes pretty-printer expects. There are a few implementations of annotated pretty-printers of various flavors on Hackage, but they either provide only `Functor` (e.g. [[http://hackage.haskell.org/package/pretty-1.1.3.2/docs/Text-PrettyPrint- Annotated.html|pretty]], [[http://hackage.haskell.org/package/annotated- wl-pprint-0.6.0/docs/Text-PrettyPrint-Annotated-Leijen.html|annotated-wl- pprint]]), or are of the Wadler-Leijan variety (e.g. [[http://hackage.haskell.org/package/wl-pprint-extras-3.5.0.5/docs/Text- PrettyPrint-Free-Internal.html|wl-pprint-extras]]). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8809#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler