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March 8, 2018 06:53
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Compiling neural's Data.FixedSize.Vector Couldn't match type ‘n + 1’ with ‘1 + n’
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[12 of 22] Compiling Data.FixedSize.Vector ( src/Data/FixedSize/Vector.hs, .stack-work/dist/x86_64-osx/Cabal-2.0.1.0/build/Data/FixedSize/Vector.o ) | |
/private/var/folders/rl/lpwgmdlj6ld9pljmv6_gj4hh0000gn/T/stack56339/neural-0.3.0.1/src/Data/FixedSize/Vector.hs:104:22: error: | |
• Couldn't match type ‘n + 1’ with ‘1 + n’ | |
Expected type: Vector (n + 1) a | |
Actual type: Vector (1 + n) a | |
NB: ‘+’ is a type function, and may not be injective | |
• In the expression: Vector $ VS.cons x xs | |
In an equation for ‘cons’: | |
cons x (Vector xs) = Vector $ VS.cons x xs | |
• Relevant bindings include | |
xs :: VS.Vector n a (bound at src/Data/FixedSize/Vector.hs:104:16) | |
cons :: a -> Vector n a -> Vector (n + 1) a | |
(bound at src/Data/FixedSize/Vector.hs:104:1) | |
| | |
104 | cons x (Vector xs) = Vector $ VS.cons x xs | |
| ^^^^^^^^^^^^^^^^^^^^^ | |
/private/var/folders/rl/lpwgmdlj6ld9pljmv6_gj4hh0000gn/T/stack56339/neural-0.3.0.1/src/Data/FixedSize/Vector.hs:112:28: error: | |
• Couldn't match type ‘n + 1’ with ‘1 + n0’ | |
Expected type: VS.Vector (1 + n0) a | |
Actual type: VS.Vector (n + 1) a | |
NB: ‘+’ is a type function, and may not be injective | |
The type variable ‘n0’ is ambiguous | |
• In the first argument of ‘VS.head’, namely ‘v’ | |
In the expression: VS.head v | |
In an equation for ‘vhead’: vhead (Vector v) = VS.head v | |
• Relevant bindings include | |
v :: VS.Vector (n + 1) a | |
(bound at src/Data/FixedSize/Vector.hs:112:15) | |
vhead :: Vector (n + 1) a -> a | |
(bound at src/Data/FixedSize/Vector.hs:112:1) | |
| | |
112 | vhead (Vector v) = VS.head v | |
| ^ | |
/private/var/folders/rl/lpwgmdlj6ld9pljmv6_gj4hh0000gn/T/stack56339/neural-0.3.0.1/src/Data/FixedSize/Vector.hs:120:37: error: | |
• Couldn't match type ‘n + 1’ with ‘1 + n’ | |
Expected type: VS.Vector (1 + n) a | |
Actual type: VS.Vector (n + 1) a | |
NB: ‘+’ is a type function, and may not be injective | |
• In the first argument of ‘VS.tail’, namely ‘v’ | |
In the second argument of ‘($)’, namely ‘VS.tail v’ | |
In the expression: Vector $ VS.tail v | |
• Relevant bindings include | |
v :: VS.Vector (n + 1) a | |
(bound at src/Data/FixedSize/Vector.hs:120:15) | |
vtail :: Vector (n + 1) a -> Vector n a | |
(bound at src/Data/FixedSize/Vector.hs:120:1) | |
| | |
120 | vtail (Vector v) = Vector $ VS.tail v | |
| ^ |
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