Anatoly Yakovenko <[email protected]> wrote: > On Fri, Apr 10, 2009 at 1:36 PM, Anatoly Yakovenko > <[email protected]> wrote: > > I am trying to build ParseP on the latest ghc, and i am getting > > this error: > > > > Text/ParserCombinators/ParseP/Interface.hs:26:17: > > __ __Could not find module `Data.ByteString.Char8': > > __ __ __it is a member of package bytestring-0.9.1.4, which is hidden > > > > what does "hidden" mean? __why does this work in ghci > > > >> import Data.ByteString > >> import Data.ByteString.Char8 > >> > > > > without any problems > > > Ah, bytestring was missing from the build-depends, > > what a confusing error message, can we change it to say > > "package Foo is missing from the MyPackage.cabal build-depends" > > would be a lot more obvious how to fix it. > The problem is that ghc doesn't know that, and shouldn't[1]: All it sees is a -hide-all-packages on its command line, you can witness it by calling cabal with the -v flag.
OTOH, having some cross-compiler, machine-readable format to describe errors would enable cabal to do some holding of hands, as well as save ide developers from having to write all these boring parsers. [1] For UNIX fundamentalists, like me, MUST NOT -- (c) this sig last receiving data processing entity. Inspect headers for copyright history. All rights reserved. Copying, hiring, renting, performance and/or quoting of this signature prohibited. _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
