parser: opt_kind_sig has incorrect SrcSpan

The production for opt_kind_sig is

opt_kind_sig :: { Located (Maybe (LHsKind RdrName)) }
        :                             { noLoc Nothing }
        | '::' kind                   {% ajl (sLL $1 $> (Just $2)) AnnDcolon (gl $1) }

The outer Location is used only to get the full span for the enclosing declration, and is then stripped. The inner LHsKind then has a SrcSpan that does not include the '::'

Extend the SrcSpan on $2 to include $1

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	mpickering
Operating system
Architecture