Ticket #4529 (closed bug: invalid)
Deriving Data does not work for attached code
For attached code I get this error:
Test2.hs:19:48: Could not deduce (Real r, Random r) from the context (Data r, Typeable1 t) arising from a use of `f' Possible fix: add (Real r, Random r) to the context of the type signature for `dataCast1' or the instance declaration In the first argument of `gcast1', namely `f' In the expression: gcast1 f In an equation for `dataCast1': dataCast1 f = gcast1 f
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