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T23308.hs:12:14: error: [GHC-23517]
• A newtype constructor must have exactly one field
but ‘B1’ has two
B1 :: C1 -> C1 -> B1
• In the definition of data constructor ‘B1’
In the newtype declaration for ‘B1’
T23308.hs:17:20: error: [GHC-07525]
• A newtype constructor must not have existential type variables
B2 :: forall (x :: C2). Proxy x -> B2
• In the definition of data constructor ‘B2’
In the newtype declaration for ‘B2’
T23308.hs:23:21: error: [GHC-07525]
• A newtype constructor must not have existential type variables
B2' :: forall (x :: C2'). F2' x -> B2'
• In the definition of data constructor ‘B2'’
In the newtype declaration for ‘B2'’
T23308.hs:28:20: error: [GHC-45219]
• Data constructor ‘B3’ returns type ‘B2’
instead of an instance of its parent type ‘B3’
• In the definition of data constructor ‘B3’
In the newtype declaration for ‘B3’
T23308.hs:33:22: error: [GHC-89498]
• A newtype must not be a GADT
B4 :: C4 -> B4 Int
• In the definition of data constructor ‘B4’
In the newtype declaration for ‘B4’
T23308.hs:38:22: error: [GHC-17440]
• A newtype constructor must not have a context in its type
B5 :: forall a. Num a => B5 (a, a)
• In the definition of data constructor ‘B5’
In the newtype declaration for ‘B5’
T23308.hs:38:22: error: [GHC-89498]
• A newtype must not be a GADT
B5 :: forall a. Num a => B5 (a, a)
• In the definition of data constructor ‘B5’
In the newtype declaration for ‘B5’
T23308.hs:38:22: error: [GHC-23517]
• A newtype constructor must have exactly one field
but ‘B5’ has none
B5 :: forall a. Num a => B5 (a, a)
• In the definition of data constructor ‘B5’
In the newtype declaration for ‘B5’
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