Won't show include all the components? I wanted to include only the type
name.
I could probably get away with bundling all the contents into the error
string but it would be nice to know if there is a standard way to get type
names like this.
On Sun, Jan 12, 2014 at 2:33 PM, fa-ml
On Sun, Jan 12, 2014 at 02:04:40PM +0000, Gareth Morgan wrote:
I have a sum type, when the input is type A I want to process it, when it is type B I want to return MyError "Expected type A but actually got type B". However I also have C,D,E,F, etc which should also return similar errors so don't want to hardcode this string.
Would pattern matching be enough for you? i.e. (very crude):
data Test = Alfa | Beta | Gamma deriving (Show)
testAlfa Alfa = undefined -- put your process function here testAlfa o = error $ "wasn't expecting " ++ show o
main = testAlfa Beta
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