parser: ParStmt has incorrect SrcSpan

The production for pquals is

pquals :: { Located [[LStmt RdrName (LHsExpr RdrName)]] }
    : squals '|' pquals
                     {% addAnnotation (gl $ last $ unLoc $1) AnnVbar (gl $2) >>
                        return (L (getLoc $2) (reverse (unLoc $1) : unLoc $3)) }
    | squals         { L (getLoc $1) [reverse (unLoc $1)] }

This assigns the location of the '|' to the entire returned value.

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
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