Inconsistency in GADTs?
f :: Ord a => Eq a => a -> Bool
f = …
this is allowed but not in GADTs
data F a where
MkF :: Ord a => Eq a => a -> F a
-- <interactive>:48:16: error:
-- • Data constructor ‘MkF’ returns type ‘Eq a => a -> F a’
-- instead of an instance of its parent type ‘F a’
-- • In the definition of data constructor ‘MkF’
-- In the data type declaration for ‘F’
not a big deal
Trac metadata
Trac field | Value |
---|---|
Version | 8.0.1 |
Type | Task |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |