#12389: Limit duplicate export warnings for datatypes -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: feature request | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 7.10.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #11959 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): Well you don't really want to "silence the warning from duplicate constructors/patterns within the list". You want to silence ''this'' duplicate of `Bar`. If you happen to repeat a different constructor elsewhere in the export list by accident, you'd still want a warning about that. So it would more appropriate to use a mechanism for locally disabling warnings. Since you can already write what you need with `#if Condition1 || Condition2`, it's not a problem anyways. At some point you may be better off just disabling the warning entirely. Warnings about redundancies are too hard when the compiler can't see your entire program at once. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12389#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler