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- Creating a LookaheadIterator as a general class that could be used.
- Wrap symbols in a symbol struct that tracks symbol start and end
position for error reporting.
- Make a struct for position in a file as well.
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ALso the parser is next up. But I want to get some frontend
done so it won't whine at me so much.
The lexer has a lot more to go, I'm sure, but right now it
does all the basics that I need it to do.
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Tokens now can only have a-z, A-Z, or 0-9 in them, we can add more
later, _ and - maybe? but this lets us easily break on = and other
things we may want.
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