How-To film · 54
Parse, don’t split
Change a valid arithmetic expression to invalid syntax and watch Grid return structured rejection evidence instead of turning the parse into a model error.
Read transcript
- Splitting finds separators. Parsers explain syntax.
- This arithmetic grammar accepts the expression as a complete parse.
- Named capture returns three numbers in source order.
- Now change the source to two plus star three.
- The parse fails, captures fall to zero, and the model stays healthy.
- Grid reports the exact rejection: zero-based offset four, where it found the star.
- Keep rejection structured.
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