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{-# LANGUAGE FunctionalDependencies #-}
module T9971 where
type Vertex v = v Double
class C a b | b->a where
op :: a -> b
foo :: Vertex x
foo = error "urk"
bar x = [op foo, op foo]
-- This gives rise to a [D] Vertex a1 ~ Vertex a2
-- And that made the canonicaliser go into a loop (#9971)
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