RE: unused import not always reported

I've looked into this a bit.  There is certainly something wrong going
on in the 5.04 branch.  But in fact the way in which we compute usage
information has changed significantly in the HEAD, and I'm reluctant to
invest much time in finding non-fatal bugs in the branch.   I'm pretty
sure that the bug lies in code which does not exist in the HEAD (done
another way).

If this comes up in the HEAD, or in the next release, please let us
know.  Otherwise I'm going to park this one!

Simon


|  -----Original Message-----
|  From: Christian Maeder [mailto:maeder@xxxxxx]
|  Sent: 04 April 2003 17:01
|  To: Simon Peyton-Jones
|  
|  > I believe that the state of play on this one is that (a) we'd like
to
|  > fix it, but (b) we can't reproduce it without help from you.  If
you
|  > send us source code we'll look at it.
|  
|  Ok, unfortunately it needs really many sources (and long to compile).
|  But the sources are world-readable anyway. You'll need the
directories
|  "uni" and "HetCATS" from:
|  
|
CVSROOT=:pserver:cvsread@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:/repository
|  
|  I'll prepare a skript (and check if the bug still occurs without
further
|  dependencies).
|  
|  Christian
|  
|  > Thanks
|  >
|  > Simon
|  >
|  > | -----Original Message-----
|  > | From: Christian Maeder [mailto:maeder@xxxxxx]
|  > | Sent: 21 March 2003 15:52
|  > | To: glasgow-haskell-bugs@xxxxxxxxxxx
|  > |
|  > | How is it possible that an unused import warning is not always
|  > emitted?
|  > |
|  > | Below I get a warning when I recompile everything, but no warning
when
|  > I
|  > | only recompile the Main module (that contains the unused import).
In
|  > | fact Main.hi changes.
|  > |
|  > | Cheers Christian
|  > |
|  > | Compiling GUI.ConvertDevToAbstractGraph (
|  > | GUI/ConvertDevToAbstractGraph.hs, GUI/ConvertDevToAbstractGraph.o
)
|  > | Compiling Main             ( GUI/hetdg.hs, GUI/hetdg.o )
|  > |
|  > | GUI/hetdg.hs:1:
|  > |      Warning: Module `Data.IORef' is imported, but nothing from
it is
|  > used
|  > |               (except perhaps to re-export instances visible in
|  > | `Data.IORef')
|  > | ghc: linking ...
|  > | maeder@turing:~/haskell/HetCATS> ll GUI/Main.hi
|  > | maeder@turing:~/haskell/HetCATS> ll GUI/Main.hi
|  > | -rw-r--r--    1 maeder   wimi         5272 2003-03-21 16:47
|  > GUI/Main.hi
|  > | maeder@turing:~/haskell/HetCATS> rm GUI/Main.hi
|  > |
|  > |
|  > | [omitted the list of Skipping after ghc --make -fglasgow-exts
|  > | -fwarn-unused-imports ...]
|  > |
|  > | Skipping  GUI.ConvertDevToAbstractGraph (
|  > | GUI/ConvertDevToAbstractGraph.hs, GUI/ConvertDevToAbstractGraph.o
)
|  > | Compiling Main             ( GUI/hetdg.hs, GUI/hetdg.o )
|  > | ghc: linking ...
|  > | maeder@turing:~/haskell/HetCATS> ll GUI/Main.hi
|  > | -rw-r--r--    1 maeder   wimi         5840 2003-03-21 16:48
|  > GUI/Main.hi
|  > |
|  > |
|  > |
|  > |
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