Changes to Typeable

José Pedro Magalhães jpm at
Wed Oct 3 14:04:23 CEST 2012

On Wed, Oct 3, 2012 at 1:01 PM, Simon Peyton-Jones <simonpj at>wrote:

> * If we do make Typeable instances by default, there are two paths
>    Plan A (easy): make GHC derive Typeable for everything, deprecate
>             all uses of 'deriving Typeable'.  Small downside: some programs
>             that are currently rejected will be accepted.

How about manually written instances of Typeable?

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