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T21158.hs:12:14: error:
• Couldn't match type: F b0
with: F b
Expected: [F b]
Actual: [F b0]
NB: ‘F’ is a non-injective type family
The type variable ‘b0’ is ambiguous
• In a record update at field ‘x’,
with type constructor ‘T’
and data constructor ‘MkT’.
In the expression: emptyT {x = newx}
In an equation for ‘foo1’: foo1 newx = emptyT {x = newx}
• Relevant bindings include
foo1 :: [Int] -> T b (bound at T21158.hs:12:1)
T21158.hs:15:49: error:
• Couldn't match type: F b1
with: F b
Expected: [F b]
Actual: [F b1]
NB: ‘F’ is a non-injective type family
The type variable ‘b1’ is ambiguous
• In the second argument of ‘MkT’, namely ‘y’
In the expression: MkT newx y
In a case alternative: MkT x y -> MkT newx y
• Relevant bindings include
y :: [F b1] (bound at T21158.hs:15:35)
foo2 :: [Int] -> T b (bound at T21158.hs:15:1)
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