My understanding of these things is limited, but what would stop me,
theoretically speaking, of making a version of ghc with these
primitives added:

type Prompt r

reset :: (Prompt r -> r) -> r
shift :: Prompt r -> ((a -> _) -> r) -> a

(Where _ is either r or forall b. b)

-- 
Taral <[EMAIL PROTECTED]>
"Please let me know if there's any further trouble I can give you."
    -- Unknown
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