anti   = lexeme $
         do  symbol "$"
             c <- small
             cs <- many idchar
             return $ AntiIntExpr (c : cs)
anti   = lexeme $
         do  symbol "$"
             c <- small
             cs <- many idchar
             return $ AntiIntExpr (c : cs)
anti   = lexeme $
         do  symbol "$"
             c <- small
             cs <- many idchar
             return $ AntiIntExpr (c : cs)