On 1 July 2011 11:35, Brent Yorgey <byor...@seas.upenn.edu> wrote: > On Fri, Jul 01, 2011 at 09:05:05AM +1000, Ivan Lazar Miljenovic wrote: >> 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]. > > In this case I'm pretty sure it is [()] since there is only a Show > constraint. If there were a Num constraint it would pick > Integer.
Yeah, I forgot about () -- 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
