Commit 3a71d781 authored by Simon Peyton Jones's avatar Simon Peyton Jones

Comments on oneShot

parent cdca31eb
......@@ -1326,6 +1326,10 @@ and Note [Left folds via right fold]) it was determined that it would be useful
if library authors could explicitly tell the compiler that a certain lambda is
called at most once. The oneShot function allows that.
'oneShot' is open kinded, i.e. the type variables can refer to unlifted
types as well (Trac #10744); e.g.
oneShot (\x:Int# -> x +# 1#)
Like most magic functions it has a compulsary unfolding, so there is no need
for a real definition somewhere. We have one in GHC.Magic for the convenience
of putting the documentation there.
......
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