[Hackage] #604: a feature to explicitly allow multiple versions of a single dependency

#604: a feature to explicitly allow multiple versions of a single dependency ----------------------------+----------------------------------------------- Reporter: guest | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: Cabal library | Version: 1.6.0.1 Severity: normal | Keywords: Difficulty: unknown | Ghcversion: 6.10.1 Platform: Linux | ----------------------------+----------------------------------------------- I wanted to build two executables for comparing the performance difference between happstack-server-0.3.4 and happstack-server-0.4. So I wrote below cabal file but found that cabal cannot build what I want. Here is the output for "cabal configure": {{{ aycan@fgt:~/haskell/tests/happstack-tests$ cabal configure Resolving dependencies... Configuring happstack-tests-0.1... cabal: At least the following dependencies are missing: happstack-server ==0.4 && ==0.3.4 }}} {{{ Name: happstack-tests Version: 0.1 Author: Aycan iRiCAN Stability: Experimental Category: Web Synopsis: Tests for Happstack Packages Cabal-version: >= 1.6 Build-Type: Simple Flag base4 Description: Choose the even newer, even smaller, split-up base package. Executable hello-0.3.3 Main-Is: Hello.hs Hs-source-dirs: happstack-server GHC-options: -threaded -Wall -Wwarn -O2 -fwarn-tabs -fwarn-unused- imports Build-depends: base , happstack-server == 0.3.4 Executable hello-0.4 Main-Is: Hello.hs Hs-source-dirs: happstack-server GHC-options: -threaded -Wall -Wwarn -O2 -fwarn-tabs -fwarn-unused- imports Build-depends: base , happstack-server == 0.4 }}} -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/604 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects