binops = [[binary "*" Ex.AssocLeft,
           binary "/" Ex.AssocLeft]
         ,[binary "+" Ex.AssocLeft,
           binary "-" Ex.AssocLeft]
         ,[binary "<" Ex.AssocLeft]]
binops = [[binary "*" Ex.AssocLeft,
           binary "/" Ex.AssocLeft]
         ,[binary "+" Ex.AssocLeft,
           binary "-" Ex.AssocLeft]
         ,[binary "<" Ex.AssocLeft]]
binops = [[binary "*" Ex.AssocLeft,
           binary "/" Ex.AssocLeft]
         ,[binary "+" Ex.AssocLeft,
           binary "-" Ex.AssocLeft]
         ,[binary "<" Ex.AssocLeft]]