got parse error on input `=>' on Haskell

Question

bmiTell :: => Double -> String
bmiTell bmi
    | bmi <= 18.5 = "You're underweight, you emo, you!"
    | bmi <= 25.0 = "You're supposeldly normal. Pffft, I bet you're ugly!"
    | bmi <= 30.0 = "You're fat! Lose some weight, fatty!"
    | otherwise   = "You are a whale, congratulations!"

This code got me an error, "parse error on input '=>'" I have no idea why. Any help? thank you !

Thomas M. DuBuisson · Accepted Answer · 2012-05-05 23:45:24Z

5

The line:

bmiTell :: => Double -> String

Has the symbol =>, which is used to separate out class constraints from the signature containing constrained types. However, you don't have any constraints, nothing such as Show a =>. The solution? Delete it!

bmiTell :: Double -> String

answered May 5, 2012 at 23:45

Thomas M. DuBuisson

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