Prologue.Unsafe

Documentation

fromJustNote :: String -> Maybe a -> a

head :: [a] -> a

Extract the first element of a list, which must be non-empty.

undefined :: HasCallStack => a

A special case of error. It is expected that compilers will recognize this and insert error messages which are more appropriate to the context in which undefined appears.

error :: HasCallStack => [Char] -> a

error stops execution and displays an error message.