[GHC] #8363: Order matters for unused import warnings when reexporting identifiers
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Thu Sep 26 17:51:35 CEST 2013
#8363: Order matters for unused import warnings when reexporting identifiers
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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:
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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>
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