These are the packages that would be merged, in reverse order:

Calculating dependencies   ... done!
[ebuild  N    ] dev-util/darcs-1.0.9  USE="-doc" 1,035 kB 
[ebuild  N    ]  net-misc/curl-7.16.4  USE="ipv6 ssl -ares -gnutls -idn -kerberos -ldap -nss -test" 1,630 kB 
[ebuild  N    ]  dev-haskell/mtl-1.0  0 kB 
[ebuild  N    ]  dev-haskell/html-1.0  0 kB 
[ebuild  N    ]  dev-haskell/quickcheck-1.0  0 kB 
[ebuild     UD]   dev-lang/ghc-6.4.2 [6.6.1] USE="-X% -binary -doc -ghcbootstrap -openal% -opengl% -test% (-bash-completion%)" 22,893 kB 

Total: 6 packages (1 downgrade, 5 new), Size of downloads: 25,557 kB