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LinearVar.hs:5:5: error:
• Couldn't match type ‘m’ with ‘'Many’
‘m’ is a rigid type variable bound by
the type signature for:
f :: forall a b. a -> b
at LinearVar.hs:4:1-16
Expected type: a # m -> b
Actual type: a -> b
• In the expression: undefined :: a -> b
In an equation for ‘f’: f = undefined :: a -> b
• Relevant bindings include
f :: a # m -> b (bound at LinearVar.hs:5:1)
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