decl_cls : at_decl_cls { LL (unitOL (L1 (TyClD (unLoc $1)))) }
| decl { $1 }
+ -- A 'default' signature used with the generic-programming extension
+ | 'default' infixexp '::' sigtypedoc
+ {% do { (TypeSig l ty) <- checkValSig $2 $4
+ ; return (LL $ unitOL (LL $ SigD (GenericSig l ty))) } }
+
decls_cls :: { Located (OrdList (LHsDecl RdrName)) } -- Reversed
: decls_cls ';' decl_cls { LL (unLoc $1 `appOL` unLoc $3) }
| decls_cls ';' { LL (unLoc $1) }
| '$(' exp ')' { LL $ mkHsSpliceTy $2 }
| TH_ID_SPLICE { LL $ mkHsSpliceTy $ L1 $ HsVar $
mkUnqual varName (getTH_ID_SPLICE $1) }
--- Generics
- | INTEGER { L1 (HsNumTy (getINTEGER $1)) }
-- An inst_type is what occurs in the head of an instance decl
-- e.g. (Foo a, Gaz b) => Wibble a b
: '|' guardquals '=' exp { sL (comb2 $1 $>) $ GRHS (unLoc $2) $4 }
sigdecl :: { Located (OrdList (LHsDecl RdrName)) }
- : infixexp '::' sigtypedoc {% do s <- checkValSig $1 $3
- ; return (LL $ unitOL (LL $ SigD s)) }
- -- See Note [Declaration/signature overlap] for why we need infixexp here
+ :
+ -- See Note [Declaration/signature overlap] for why we need infixexp here
+ infixexp '::' sigtypedoc
+ {% do s <- checkValSig $1 $3
+ ; return (LL $ unitOL (LL $ SigD s)) }
| var ',' sig_vars '::' sigtypedoc
{ LL $ toOL [ LL $ SigD (TypeSig n $5) | n <- $1 : unLoc $3 ] }
| infix prec ops { LL $ toOL [ LL $ SigD (FixSig (FixitySig n (Fixity $2 (unLoc $1))))
-- It is possible to enable bracketing (associating) qualifier lists by uncommenting the lines with {| |}
-- above. Due to a lack of consensus on the syntax, this feature is not being used until we get user
--- demand. Note that the {| |} symbols are reused from -XGenerics and hence if you want to compile
--- a program that makes use of this temporary syntax you must supply that flag to GHC
+-- demand.
transformqual :: { Located ([LStmt RdrName] -> Stmt RdrName) }
-- Function is applied to a list of stmts *in order*