Inferred type is rejected
Consider
class C a where
op :: a -> ()
f x = op [x]
we get
Foo.hs:14:1: error:
Non type-variable argument in the constraint: C [t]
(Use FlexibleContexts to permit this)
When checking that ‘f’ has the inferred type
f :: forall t. C [t] => t -> ()
Arguably, if FlexibleContexts
is not on, we should not infer a type that will immediately be rejected.
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |