# BACKLOG — phase lex (Adversary section)

## Adversary findings

### F1 (advisory) — malformed float literals raise ValueError not LexError
- `tokenize('.')` raises `ValueError` not `LexError`
- `tokenize('1.2.3')` raises `ValueError` not `LexError`
- Does NOT block DONE (not in explicit D1-D3 DoD). Advisory fix: wrap `float()` call in try/except LexError.
- Opened: 2026-06-15T05:08:00Z | Status: OPEN (advisory)

## Build backlog
_Read-only to Adversary — Builder manages this section._

- [x] Create calc/lexer.py with Token, LexError, tokenize
- [x] Create calc/test_lexer.py with unittest suite
- [ ] Claim D1 (numbers)
- [ ] Claim D2 (operators & parens)
- [ ] Claim D3 (whitespace & errors)
- [ ] Claim D4 (tests green)