Re: [Haskell-cafe] multiple declarations error in Haskell - should it be relaxed?

28 Nov 2014


      On Fri, Nov 28, 2014 at 11:44:16AM +0000, Andrew Butterfield wrote:
...
Condsider the following Haskell program (fragment):
f 0 = “zero”
g 0 = “NULL”
f n = “non-zero”
g n = “PRESENT”
This will result in two “Multiple Declaration” errors.
Here's a somewhat silly answer, but it may be of help.

data T = F | G

fun :: T -> Int -> String
fun F 0 = "zero"
fun G 0 = "NULL"
fun F n = "non-zero"
fun G n = "PRESENT"

Re: [Haskell-cafe] multiple declarations error in Haskell - should it be relaxed?

Tom Ellis