[project @ 2005-05-19 11:15:40 by simonpj]
Tune up the reporting of unused imports Merge to STABLE (I think the earlier change made it across) (PS: the commit also does some trimming of redundant imports. If they don't merge, just discard them.) My earlier fixes to the reporting of unused imports still missed some obscure cases, some of which are now fixed by this commit. I had to make the import-provenance data type yet richer, but in fact it has more sharing now, so it may be cheaper on space. There's still one infelicity. Consider import M( x ) imoprt N( x ) where the same underlying 'x' is involved in both cases. Currently we don't report a redundant import, because dropping either import would change the qualified names in scope (M.x, N.x). But if the qualified names aren't used, the import is indeed redundant. Sadly we don't know that, because we only know what Names are used. Left for the future! There's a comment in RnNames.warnDuplicateImports This commit also trims quite a few redundant imports disovered by the new setup.
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