Add a compile-time warning to users of 'volume'
Add a compile-time warning to users of 'volume'

Ignore-this: 32b7ad2144cd69b8a188ccfaa62b7ee4

darcs-hash:20090603231243-928c4-8805c2b8e8fc20312fc0b22321891e4bce1421ae.gz

beni55/libmpd-haskell,sol/libmpd-haskell