On Jul 22, 2016, at 4:58 AM, Oliver Charles <ollie@ocharles.org.uk> wrote:

I have wanted this exact function before. +1

On Fri, 22 Jul 2016, 12:27 a.m. Edward Kmett, <ekmett@gmail.com> wrote:

No objection here. +1

-Edward

On Fri, Jul 22, 2016 at 1:18 AM, David Feuer <david.feuer@gmail.com> wrote:

In Data.Type.Equality, we have both

castWith :: (a :~: b) -> a -> b

and

gcastWith :: (a :~: b) -> (a ~ b => r) -> r


But in Data.Type.Coercion we only have


coerceWith :: Coercion a b -> a -> b


It seems to me that for the sake of consistency, we should add


gcoerceWith :: Coercion a b -> (Coercible a b => r) -> r
gcoerceWith Coercion a = a

David Feuer
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