On Sat, May 19, 2007 at 06:09:45PM +0100, Frederik Eaton wrote:
If you have GHC-6.6 or greater, try: let n = 2 in GHC.Base.breakpoint ()
Interesting, apparently that statement also contains the word 'print': :)
$ ghci fly:~ ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 6.6.20070420, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help.
Loading package base ... linking ... done.
let n = 2 in GHC.Base.breakpoint
<interactive>:1:0: No instance for (Show (a -> a)) arising from use of `print' at <interactive>:1:0-31 Possible fix: add an instance declaration for (Show (a -> a)) In the expression: print it In a 'do' expression: print it
You forgot the () at the end. (And btw, ghci's autoprinting works by wrapping your code in print) Stefan