Next AST Attempt

[Lokathor]

This makes the AST far more general in what it parses, and then we'll save rejection of inputs for later stages of compilation. This allows us to give much better errors than some sort of generic "i can't parse this"

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with the old parser, a < 0 would parse and b < 0 wouldn't parse

with the new parser, a < 0 and b < 0 will both parse, and then rejecting using b as a register to test will be a later stage of compilation when we can give a clear answer of what went wrong.