:: a -> b -> (a, b)

(-<) :: a -> e -> (a, e)
algebraic-graphs Algebra.Graph.Labelled Algebra.Graph.Labelled.AdjacencyMap
The left-hand part of a convenient ternary-ish operator x-<e>-y for creating labelled edges. 
x -<e>- y == edge e x y
(<#>) :: a -> b -> (a, b)
xmlgen Text.XML.Generator
Shortcut for constructing pairs. Used in combination with xelem for separating child-attributes from child-elements.
withState :: Monad m => a -> s -> m (a, s)
extensible-effects Control.Eff.State.Lazy Control.Eff.State.Strict
Embed a pure value in a stateful computation, i.e., given an initial state, how to interpret a pure value in a stateful computation.