On Tue, May 25, 2010 at 12:36 PM, Ionut G. Stan
Oh, and a small off-topic question? Is it considered a good practice to use implicit imports in Haskell? I'm trying to learn from existing packages, but all those "import all" statements drive me crazy.
It's pretty common but I don't like it. Whenever I have to debug someone else's code usually the first thing I'll do is make all the import lists explicit so I can work out where a troublesome function is coming from, and that's a bit of a waste of time. In some cases though it can get a little silly. Here is an import statement from one of my projects: import Language.Haskell.Exts ( Alt (Alt), Binds (BDecls), Decl (PatBind, FunBind, InfixDecl), Exp (App, Case, Con, Do, If, InfixApp, Lambda, LeftSection, Let, List, Lit, Paren, RightSection, Tuple, Var, XPcdata), GuardedAlt (GuardedAlt), GuardedAlts (UnGuardedAlt, GuardedAlts), Literal (Char, Frac, Int, String), Match (Match), Op (ConOp, VarOp), Pat (PApp, PInfixApp, PList, PLit, PParen, PTuple, PVar, PWildCard), Name (Ident, Symbol), QName (Special, UnQual), QOp (QConOp, QVarOp), Rhs (UnGuardedRhs), SpecialCon (Cons), SrcLoc (), -- (SrcLoc), Stmt (Generator, LetStmt, Qualifier), preludeFixities, prettyPrint ) ...there comes a certain point where one can probably leave the biggest import implicit, on the basis that "if it's from nowhere else, it's probably there".