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<interactive>:12:1:
Unacceptable result type in foreign declaration: Double
Safe Haskell is on, all FFI imports must be in the IO monad
When checking declaration:
foreign import ccall safe "static sin" c_sin :: Double -> Double
<interactive>:13:1:
Not in scope: ‛c_sin’
Perhaps you meant ‛c_sin'’ (line 8)
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