How do you import Data.Heap?

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Sorry for such a dumb question. I'm trying to import Data.Heap, but I get this error message:

> import Data.Heap

<no location info>: error:
    Could not find module ‘Data.Heap’
    Perhaps you meant
      Data.Map (from containers-0.5.7.1@containers-0.5.7.1)

Haven't had trouble with other imports.

Thanks.

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