ARC grammar: overlapping values Color and Pos

[pwochner]

# grammar.jl
Color = |(0:9)
Pos = |(1:30)

When expanded, the grammar has a rule for each value for Color (from 0 to 9), but for Pos, the grammar only covers values 10 to 30.

We could use a tuple for Pos, but that would make the grammar very big. Can we think of a elegant solution for this?

[THinnerichs]

As discussed previously, I see multiple solutions:

1. Add units to Color: Comparisons + operations would still work.
2. Do something ugly like

Color = Int(1) | ...

As the expression differs, this should work.