On 4 October 2013 10:56, Heinrich Apfelmus <apfel...@quantentunnel.de> wrote:
> In particular, the  Locker  stores arbitrary values like  Dynamic , except
> that values are extracted and removed with the help of a  Key . This gets
> rid of the  Typeable  constraint.

lock :: Key a -> a -> Locker

I can't pass anything with class constraints to that.
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