Re: [Haskell-cafe] exceptions vs. Either

Ketil Malde writes:

Hmm...if I run it through CPP and #define HEAD (\x -> if null x then error ("__FILE__:__LINE__") else head x) is the __LINE__ resolved at the place of declaration or at the place of usage?

According to the C standard, at the position of /usage/ of the macro `HEAD'. Incidentally, cpphs does not yet implement __FILE__ or __LINE__ replacements. Is their usage widespread amongst Haskell users? Regards, Malcolm