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T7786.hs:86:22: error:
• Couldn't match type ‘xxx’ with ‘'Empty’
Inaccessible code in
a pattern with constructor: Nil :: forall a. Sing 'Empty,
in a pattern binding in
'do' block
• In the pattern: Nil
In the pattern: Nil :: Sing xxx
In a stmt of a 'do' block:
Nil :: Sing xxx <- return
(buryUnder (dbKeys sub) k Nil `intersectPaths` dbKeys db)
T7786.hs:86:49: error:
• Couldn't match type ‘xxx’
with ‘Intersect (BuriedUnder sub k 'Empty) inv’
Expected type: Sing xxx
Actual type: Sing (Intersect (BuriedUnder sub k 'Empty) inv)
• In the first argument of ‘return’, namely
‘(buryUnder (dbKeys sub) k Nil `intersectPaths` dbKeys db)’
In a stmt of a 'do' block:
Nil :: Sing xxx <- return
(buryUnder (dbKeys sub) k Nil `intersectPaths` dbKeys db)
In the expression:
do { Nil :: Sing xxx <- return
(buryUnder (dbKeys sub) k Nil `intersectPaths` dbKeys db);
return $ Sub db k sub }
• Relevant bindings include
sub :: Database sub (bound at T7786.hs:86:13)
k :: Sing k (bound at T7786.hs:86:11)
db :: Database inv (bound at T7786.hs:86:8)
addSub :: Database inv
-> Sing k
-> Database sub
-> Maybe (Database (BuriedUnder sub k inv))
(bound at T7786.hs:86:1)
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