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kmizu/M.hs

Created July 8, 2019 05:35
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Ambiguous occurrence
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M.hs
class M a where
(+) :: a -> a -> a
add x y = x + y
main = do print "Hello"
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kmizu commented Jul 8, 2019

$ ghc M.hs
[1 of 1] Compiling Main ( M.hs, M.o )

M.hs:4:13: error:
Ambiguous occurrence ‘+’
It could refer to either ‘Prelude.+’,
imported from ‘Prelude’ at M.hs:1:1
(and originally defined in ‘GHC.Num’)
or ‘Main.+’, defined at M.hs:2:3

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