the embedded grammars now work with both the pure Haskell and the Haskell binding API

src/runtime/haskell/PGF.hs

@@ -51,6 +51,7 @@ module PGF(
            mkStr,    unStr,
            mkInt,    unInt,
            mkDouble, unDouble,
+           mkFloat,  unFloat,
            mkMeta,   unMeta,
            -- extra
            pExpr,

src/runtime/haskell/PGF/Expr.hs

@@ -6,6 +6,7 @@ module PGF.Expr(Tree, BindType(..), Expr(..), Literal(..), Patt(..), Equation(..
                 mkStr,    unStr,
                 mkInt,    unInt,
                 mkDouble, unDouble,
+                mkFloat,  unFloat,
                 mkMeta,   unMeta,
 
                 normalForm,
@@ -154,6 +155,9 @@ unDouble (ETyped e ty)   = unDouble e
 unDouble (EImplArg e)    = unDouble e
 unDouble _               = Nothing
 
+mkFloat = mkDouble
+unFloat = unDouble
+
 -- | Constructs an expression which is meta variable
 mkMeta :: Int -> Expr
 mkMeta i = EMeta i