On 1 July 2011 08:58, Joshua Ball <joshbb...@gmail.com> wrote: > GHCi seems to be clever about some things: > > If I try to print the empty list in ghci, I encounter no problems: > > Prelude> [] > [] > Prelude> show [] > "[]" > Prelude> print [] > [] > > Even though the type of the list is clearly unknown, it must be > picking SOME type. (why does it print [] instead of "")?
Type defaulting: if you don't specify a type, then ghci makes it [Integer]. > If I write a program in a file and load it in > > main = print [] > > Then I get the ambiguous type variable error that I would expect. Why > doesn't ghci generate this error at the prompt? Because ghc doesn't do type defaulting. -- Ivan Lazar Miljenovic ivan.miljeno...@gmail.com IvanMiljenovic.wordpress.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
