reify never provides the declaration of variables

The information returned by reify when provided a variable Name is

VarI Name Type (Maybe Dec) Fixity

The Dec part, due to be nested in Maybe, is clearly optional. In fact, according to Language.Haskell.TH.Syntax:

-- Nothing for lambda-bound variables, and
-- for anything else TH can't figure out
-- E.g. [| let x = 1 in $(do { d <- reify 'x; .. }) |]

However, the typechecker (TcSplice module) always returns Nothing. So it's simply not implemented.

I suggest either implementing the feature or removing the Dec part of VarI. Either way, the type should be consistent with the features offered in TH.

Trac metadata

Trac field	Value
Version	6.8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Template Haskell
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Operating system	Unknown
Architecture	Unknown