parser : the API annotation on opt_sig is being discarded

The opt_sig production is defined as

opt_sig :: { ([AddAnn],Maybe (LHsType RdrName)) }
        : {- empty -}                   { ([],Nothing) }
        | '::' sigtype                  { ([mj AnnDcolon $1],Just $2) }

It is used in the alt and decl_no_th productions, but neither of them add the returned annotations.

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