instance Data (Complex a)

Simon Peyton-Jones simonpj at
Wed Nov 1 05:21:57 EST 2006

I've added 'deriving Data' to Complex.  (There are probably other
missing ones too...let us know.)


| -----Original Message-----
| From: glasgow-haskell-users-bounces at
[mailto:glasgow-haskell-users-bounces at]
| On Behalf Of Chad Scherrer
| Sent: 26 October 2006 19:08
| To: GHC Users
| Subject: instance Data (Complex a)
| I was playing around with the Data.Generics stuff, and I'm getting an
| error that says
| No instance for (Data (Complex Double))
| Looking at the source for Data.Complex, I see it is an instance of
| Typeable, but not of Data. Is there a reason not to add "deriving
| Data" on the end of this?
| Thanks,
| Chad
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