Return a state-monad function that assumes the state to be a map and
returns the value corresponding to the given key. The state is not modified.
Source
clojure/contrib/monads.clj:365
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(defn fetch-val
"Return a state-monad function that assumes the state to be a map and
returns the value corresponding to the given key. The state is not modified."
[key]
(domonad state-m
[s (fetch-state)]
(key s)))
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