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Trac10045.hs:6:17: error:
Found type wildcard ‘_’ standing for ‘t1 -> a -> t2’
Where: ‘t1’ is a rigid type variable bound by
the inferred type of copy :: Num a => t1 -> a -> t2
at Trac10045.hs:7:9
‘a’ is a rigid type variable bound by
the inferred type of copy :: Num a => t1 -> a -> t2
at Trac10045.hs:7:9
‘t2’ is a rigid type variable bound by
the inferred type of copy :: Num a => t1 -> a -> t2
at Trac10045.hs:7:9
To use the inferred type, enable PartialTypeSignatures
In the type signature for:
copy :: _
In the expression:
let
copy :: _
copy w from = copy w 1
in copy ws1 1
In an equation for ‘foo’:
foo (Meta ws1)
= let
copy :: _
copy w from = copy w 1
in copy ws1 1
Relevant bindings include
ws1 :: () (bound at Trac10045.hs:5:11)
foo :: Meta -> t (bound at Trac10045.hs:5:1)
Trac10045.hs:7:9: error:
No instance for (Num a)
When checking that ‘copy’ has the inferred type
copy :: forall t t1 a. t -> a -> t1
Probable cause: the inferred type is ambiguous
In the expression:
let
copy :: _
copy w from = copy w 1
in copy ws1 1
In an equation for ‘foo’:
foo (Meta ws1)
= let
copy :: _
copy w from = copy w 1
in copy ws1 1
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