Add Typeable constraint to nextState #16
Merged
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This was already satisfied in all call-sites, so this is a one-line change. For concrete tests, this constraint is not required because matching on the
Actionwill reveal whatais, but it is necessary when defining polymorphic abstractions on top ofquickcheck-dynamic.Hopefully this is an uncontroversial change :) This is the minimum change I need to make the lockstep stuff work.