| not sure whether it is a | good idea to add location information to automatically generated code. I think it would be an excellent idea. | Do we make any assumptions | that derived code should have no location information? I don't think so. Please open a ticket for your test case, and (if you can) fix it. The location for the implicit instance should jolly well be the instance declaration for 'instance C Int'! Thanks for spotting this. Simon | -----Original Message----- | From: ghc-devs [mailto:ghc-devs-bounces@haskell.org] On Behalf Of Jan | Stolarek | Sent: 10 June 2015 14:12 | To: ghc-devs@haskell.org | Subject: Adding location information to derived code | | Hi devs, | | say I have: | | class C a where | type F a | type F a = a | | instance C Int | | During compilation of "instance C Int" GHC will derive a default | associated type instance "F Int = | Int". That instance has no location information and so any errors that it | might cause will have a | very uninformative source code location 1:1. I want to fix this but I'm | not sure whether it is a | good idea to add location information to automatically generated code. Do | we make any assumptions | that derived code should have no location information? | | Janek | | --- | Politechnika Łódzka | Lodz University of Technology | | Treść tej wiadomości zawiera informacje przeznaczone tylko dla adresata. | Jeżeli nie jesteście Państwo jej adresatem, bądź otrzymaliście ją przez | pomyłkę | prosimy o powiadomienie o tym nadawcy oraz trwałe jej usunięcie. | | This email contains information intended solely for the use of the | individual to whom it is addressed. | If you are not the intended recipient or if you have received this | message in error, | please notify the sender and delete it from your system. | _______________________________________________ | ghc-devs mailing list | ghc-devs@haskell.org | http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs