Span for rule and code for token ala pest ☐ Add ability to unwind stack ☐ Add rule handler map (rule: &str, R: RuleHandler) that maps a "rule" to the function/etc that handles it Cursor Position of &str w/ useful string parsing methods Refactor engine::Reduction out and into parser::Reduction for use in template bring in 'static lifetime Refactor engine::egt and engine::builder into engine::parser ☐ Instead of panic!ing on EOF in SourceReader (source.rs:33:29), return an Option
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