Name: Anonymous 2011-10-06 13:28
$ ghci
GHCi, version 6.8.2: http://www.haskell.org/ghc/ :? for help
Loading package base ... linking ... done.
Prelude> let yoba a b = if a < b then 123 else "abc"
<interactive>:1:29:
No instance for (Num [Char])
arising from the literal `123' at <interactive>:1:29-31
Possible fix: add an instance declaration for (Num [Char])
In the expression: if a < b then 123 else "abc"
In the definition of `yoba':
yoba a b = if a < b then 123 else "abc"
Prelude>