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ghc accepts non-standard type without language extension

Ghc accepts this

f :: Eq a => Eq b => a -> b -> Bool
f a b = a==a && b==b

The nested contexts should require some language extension.

Trac metadata
Trac field Value
Version 7.8.4
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
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