Difference between revisions of "GHC/Error messages"
< GHC
Jump to navigation
Jump to search
(will fill this out once i find a small example) |
m |
||
| (8 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
GHC error messages and their meaning. |
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: |
||
| + | <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. |
||
| + | |||
| + | |||
| ⚫ | |||
TODO |
TODO |
||
Revision as of 13:49, 3 December 2009
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