Through a patch <https://git.haskell.org/ghc.git/commitdiff/aead01902e1c41e85b758dbafd15e60d08956374> by Oleg Grenrus (phadej), GHC 8 will have the following new flags: -fwarn-unused-top-binds -fwarn-unused-local-binds -fwarn-unused-pattern-binds
So you'll be able to pick and choose. On Tue, Nov 3, 2015 at 6:47 PM, Evan Laforge <qdun...@gmail.com> wrote: > [ ccing haskell-cafe since while it's a ghc flag, I'll bet most > compilers have an equivalent ] > > I really like -fwarn-unused-binds because it frequently finds bugs > where I forgot to call something or use some value. If I put an > export list on, it can find dead functions I forgot to delete. > However, there's one case where it frequently gives false positives, > and that's unused record field names. The problem is that I sometimes > use record field names as documentation, but the record itself is > internal and small, so I'm comfortable using positional pattern > matching to open it (and in fact that can be safer, since then > warn-unused-binds will make sure I used all the fields). But GHC sees > these as unused functions, so it warns about them. I can work around > by putting underscores on field names I haven't used yet, but it's a > hassle to go edit them when I want to use them. The warning can be > useful if it indicates an unused field, but since fields can also be > extracted via the positional syntax it's not reliable. The other use > of the warning for dead code or functions you forgot to use doesn't > apply to record accessors because they're trivial and compiler > generated. > > So, would it be reasonable to exclude record field accessors from > -fwarn-unused-binds? Or is there another way to work around it? I > guess GHC doesn't have a "suppress warning" pragma like Java does, but > even if we did it wouldn't be much better than changing the name, and > more likely to get stale. > _______________________________________________ > Glasgow-haskell-users mailing list > Glasgow-haskell-users@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users >
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