GHC/Error messages
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< GHC(Difference between revisions)
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GHC error messages and their meaning. | GHC error messages and their meaning. | ||
| - | == Parse error in pattern == | + | == "`foo' is not applied to enough type arguments" == |
| + | |||
| + | TODO | ||
| + | |||
| + | Example: TODO | ||
| + | |||
| + | == "`foo' is not a (visible) method of class `Bar'" == | ||
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| + | This error message occurs when one tries to instantiate a class, but did not import the functions one tries to implement. | ||
| + | |||
| + | Example: | ||
| + | <haskell> | ||
| + | import Prelude hiding ((==)) | ||
| + | |||
| + | data Foo = Foo | ||
| + | |||
| + | instance Eq Foo where | ||
| + | (==) a b = True | ||
| + | </haskell> | ||
| + | |||
| + | == "Cannot match a monotype with `Foo'" == | ||
| + | |||
| + | See [http://www.haskell.org/pipermail/haskell-cafe/2009-October/067806.html this] Haskell-Cafe thread. | ||
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| + | |||
| + | == "Parse error in pattern" == | ||
TODO | TODO | ||
Example: TODO | Example: TODO | ||
Current revision
GHC error messages and their meaning.
Contents |
1 "`foo' is not applied to enough type arguments"
TODO
Example: TODO
2 "`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
3 "Cannot match a monotype with `Foo'"
See this Haskell-Cafe thread.
4 "Parse error in pattern"
TODO
Example: TODO
