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icfp20-fail.hs:20:10: error: [GHC-83865]
• Couldn't match type: forall a. a -> a
with: b -> b
Expected: SId -> b -> b
Actual: SId -> SId
• In the expression: id
In an equation for ‘auto'1’: auto'1 = id
• Relevant bindings include
auto'1 :: SId -> b -> b (bound at icfp20-fail.hs:20:1)
icfp20-fail.hs:23:9: error: [GHC-91028]
• Couldn't match expected type ‘a’
with actual type ‘SId -> b0 -> b0’
Cannot equate type variable ‘a’
with a type involving polytypes: SId -> b0 -> b0
‘a’ is a rigid type variable bound by
the inferred type of a6 :: a
at icfp20-fail.hs:23:1-14
• In the first argument of ‘id’, namely ‘auto'2’
In the expression: id auto'2
In an equation for ‘a6’: a6 = id auto'2
• Relevant bindings include a6 :: a (bound at icfp20-fail.hs:23:1)
icfp20-fail.hs:26:16: error: [GHC-83865]
• Couldn't match type ‘SId’ with ‘b -> b’
Expected: (b -> b) -> b -> b
Actual: SId -> b -> b
• In the second argument of ‘choose’, namely ‘auto'2’
In the expression: choose id auto'2
In an equation for ‘a8’: a8 = choose id auto'2
• Relevant bindings include
a8 :: (b -> b) -> b -> b (bound at icfp20-fail.hs:26:1)
icfp20-fail.hs:30:12: error: [GHC-83865]
• Couldn't match type: forall s. ST s a
with: ST s0 a
Expected: ST s0 a -> a
Actual: (forall s. ST s a) -> a
• In the first argument of ‘id’, namely ‘runST’
In the expression: id runST x
In an equation for ‘st2’: st2 x = id runST x
• Relevant bindings include
x :: forall s. ST s a (bound at icfp20-fail.hs:30:5)
st2 :: (forall s. ST s a) -> a (bound at icfp20-fail.hs:30:1)
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