# BACKLOG — Phase `parse`

## Build backlog

- [x] Implement `calc/parser.py` with `ParseError`, `Num`, `BinOp`, `Unary`, `parse()`
- [x] Implement `calc/test_parser.py` with 20 tests covering D1–D5
- [x] Run `python -m unittest -q` — 34 tests, all pass
- [x] Claim D1–D6

## Adversary findings

_(none yet)_