On Wednesday 27 June 2007, you wrote:
Andrew: Try using catchalls in your guards
pattern1
| guard1 = | guard2 = | otherwise =
This makes it much easier to use pattern guards. "otherwise" is a reserved word used for this stuff in ghc.
Since we're quoting the standard and all, my inner pedant can't help but quibble: otherwise is not a keyword, it's a synonym for True defined in the Standard Prelude (and, in particular, goes away if you say import Prelude ()): $ cat > Foo.hs import Prelude main = print otherwise $ ghc Foo.hs -o foo $ ./foo True $ cat > Foo.hs import Prelude (print) main = print otherwise $ ghc Foo.hs -o foo Foo.hs:3:13: Not in scope: `otherwise' Sincerely, Jonathan Cast Computer Programmer http://sourceforge.net/projects/fid-core http://sourceforge.net/projects/fid-emacs