Re: [Haskell-cafe] Prelude.head: empty list

Thanks all! Plenty good options, fortunately I found my bug pretty fast by simple code inspection :)) 2016-03-12 4:28 GMT+01:00 Chris Wong :

On Sat, Mar 12, 2016 at 8:07 AM, Jonas Scholl wrote:

...

You mean like this?

default-extensions: CPP cpp-options:

-Dhead=(foldr(const)(error("head:\x20\x65mpty\x20list\x20in\x20"++__FILE__++":"++show(__LINE__))).(take$1))

That's pretty cool!

By the way: can the (take$1) be removed? foldr should be lazy enough already.

-- Chris Wong (https://lambda.xyz)

"I had not the vaguest idea what this meant and when I could not remember the words, my tutor threw the book at my head, which did not stimulate my intellect in any way." -- Bertrand Russell _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe