To declare constant variables I can do following in Ruby

```
class COLOR
   RED   = 10
   BLUE  = 20
   GREEM = 30
end

```

`COLOR::RED` returns `10`, `COLOR::BLUE` returns `20`, and so on. How do I accomplish that in Haskell?

I want to have a namespace name in front of my variable name. Maybe the example above is not a good example. For the case below, you can see including a namespace name will make a variable much easier to understand. 

```
class BASEBALL_TEAM
   GIANTS = 15
   METS = 30
   REDS = 45
   ...
end

```

`BASEBALL_TEAM::GIANTS` is much clear than `GIANTS`. 

based on the comments below, it seems the only way I can accomplish it is by doing something like below:

```
module Color (Color) where
data Color = Red | Blue | Green deriving (Eq, Show, Ord, Bounded, Enum)                        

fromEnum' x = (fromEnum x) + 10

```

to get integer value of `10` for `Color.Red`, I have to write `fromEnum Color.Red`, the syntax is not very clean.