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-- | The same as T16197, but a bit more distilled.
-- Important takeaway: The signature of `f` may not say "strict in the Bool
-- field of T", otherwise the Simplifier will drop the `seq` on the `Bool` at
-- call sites after unboxing the `T`.
module T16197b where
data T = T !Bool
data Box a = Box a
f :: T -> Box Bool
f (T b) = Box b
{-# NOINLINE f #-} -- I like NOINLINE better than artificial recursion, YMMV
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