GHC/Error messages
Jump to navigation
Jump to search
GHC error messages and their meaning.
"`foo' is not applied to enough type arguments"
TODO
Example: TODO
"`foo' is not a (visible) method of class `Bar'"
This error message occurs when one tries to instantiate a class, but did not import the functions one tries to implement.
Example:
import Prelude hiding ((==))
data Foo = Foo
instance Eq Foo where
(==) a b = True
"Cannot match a monotype with `Foo'"
See this Haskell-Cafe thread.
"Parse error in pattern"
TODO
Example: TODO