#8363: Order matters for unused import warnings when reexporting identifiers -------------------------------------+------------------------------------ Reporter: bergmark | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by simonpj): Yes, you're right. In general it's a hard problem to find the minimal set of imports that are required. (It's a kind of set-covering problem.) GHC uses a cheap and cheerful heuristic that usually does reasonably well. The code is very localised, in `RnNames.warnUnusedImportDecls`. If anyone can do better, go for it! Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8363#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler