Am Sonntag 14 Juni 2009 01:58:06 schrieb Erik de Castro Lopo:
Hi all,
I have some code (basically from http://sequence.complete.org/node/257) which has:
import Control.Exception (finally, catch, Exception (..), IOException)
...
handler (IOException e)
| isEOFError e = return ()
but gch-6.10.3 still says
Not in scope: data constructor `IOException'
Someone smack me with the cluestick please :-).
a) you only imported the type, not the data constructor(s) b) confusingly, the constructor of IOException is IOError: data IOException = IOError { ioe_handle :: Maybe Handle, -- the handle used by the action flagging -- the error. ioe_type :: IOErrorType, -- what it was. ioe_location :: String, -- location. ioe_description :: String, -- error type specific information. ioe_filename :: Maybe FilePath -- filename the error is related to. } deriving Typeable instance Exception IOException
Cheers, Erik