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:i doesn't show constraints on datatypes

If we have this module:

module Q where

data Eq a => D a = C a

then :i in ghci doesn't show the constraint:

*Q> :i D
data D a = C a  -- Defined at q.hs:4:13

Affects both HEAD and 6.8 branch.

Trac metadata
Trac field Value
Version 6.8.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system Unknown
Architecture Unknown
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