BNFC doesn't have an Int type.

src/GF/Canon/GFCC/GFCC.cf

@@ -23,8 +23,8 @@ P.   Term     ::= "(" Term "!" Term ")" ;   -- projection/selection
 S.   Term     ::= "(" [Term] ")" ;          -- sequence with ++
 KS.  Term     ::= String ;                  -- token
 KP.  Term     ::= "[" "pre" [String] "[" [Variant] "]" "]" ;
-V.   Term     ::= "$" Int ;                 -- argument
-C.   Term     ::= Int ;                     -- parameter value/label
+V.   Term     ::= "$" Integer ;                 -- argument
+C.   Term     ::= Integer ;                     -- parameter value/label
 F.   Term     ::= CId ;                     -- global constant
 FV.  Term     ::= "[|" [Term] "|]" ;        -- free variation
 W.   Term     ::= "(" String "+" [String] ")" ; -- prefix + suffix table