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Allow the evaluation of declaration splices in GHCi

As it stands GHCi cannot evaluate declaration splices because all splices are assumed to be expression splices:

> $( [d| a = True |] )
<interactive>:1:4:
    Couldn't match expected type `Language.Haskell.TH.Syntax.Exp'
                with actual type `[Language.Haskell.TH.Syntax.Dec]'
...
Trac metadata
Trac field Value
Version 7.6.1
Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component GHCi
Test case
Differential revisions
BlockedBy
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Blocking
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Operating system
Architecture
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