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-- This one triggers the bug reported in #22028, which
-- was in a test for #1092
-- The problem is that the rule
-- forall w. f (\v->w) = w
-- erroneously matches the call
-- f id
-- And that caused an assertion error.
module Foo where
f :: (Int -> Int) -> Int
{-# NOINLINE f #-}
f g = g 4
{-# RULES "f" forall w. f (\v->w) = w #-}
h1 = f (\v -> v) -- Rule should not fire
h2 = f id -- Rule should not fire
h3 = f (\v -> 3) -- Rule should fire
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