On Fri, Dec 30, 2011 at 07:55:05PM +0400, Serge D. Mechveliani wrote:
Dear GHC team,
The archive http://botik.ru/pub/local/Mechveliani/ghcBugs/ghc741candQuest.zip
contains the source of the docon-2.12 application. ghc-7.0.1 compiles it and runs the test successfully. ghc-7.4.0.20111219 cannot compile it.
1. It requires to add Show a to Integral a in a certain place. It occurs that this requirement breaks the standard (?). But all right, so far, add Show a there and see what happens further.
2. It reports that certain two packages overlap at some module. This is a matter of the `build-depends' field in docon.cabal and of the import declarations.
I tried to correct the build-depends list. But each time the compiler reports that a) some packages overlap or b) build-depends has a wrong line or c) it cannot find some module (for example, Random).
Can you please, look into ghc741candQuest.zip and set there an appropriate build-depends ? (so that make configure make build make install finish correctly). How does the user guess of this list, what is the method?
The attached patch fixes docon so that it compiles under ghc-7.4.0.20111219. Here is an explanation of the necessary changes: * The haskell98 and base packages are no longer compatible, you must choose one or the other. Choose 'haskell98' if you are coding to the Haskell 98 standard, and base if you are coding to Haskell 2010. I deleted the haskell98 package from the build-depends. * Module names like 'List', 'Maybe', 'Random' do not conform to the Haskell 2010 standard; they must be replaced with Data.List, Data.Maybe, and System.Random respectively. * Also, base no longer includes System.Random, so the 'random' package must be added to the build-depends field. -Brent