# STATUS — eval phase

_Role: Builder owns this file._

## DONE

All 5 gates PASSED (Adversary-verified 2026-06-15T05:18:03Z). No vetoes.

| Gate | Verdict |
|------|---------|
| D1   | PASS    |
| D2   | PASS    |
| D3   | PASS    |
| D4   | PASS    |
| D5   | PASS    |

## Gates

### D1 — arithmetic
**WHAT:** `evaluate(parse(tokenize(s)))` correct for `+ - * /`, precedence, parens, unary minus.
**HOW:** `python -m unittest calc.test_evaluator.TestArithmetic -v`
**EXPECTED:** 10 tests, all pass. Spot-checks:
- `"2+3*4"` → 14
- `"(2+3)*4"` → 20
- `"8-3-2"` → 3
- `"-2+5"` → 3
- `"2*-3"` → -6
**WHERE:** `calc/evaluator.py`, `calc/test_evaluator.py`

### D2 — division
**WHAT:** `/` is true division; division by zero raises `EvalError` (not `ZeroDivisionError`).
**HOW:** `python -m unittest calc.test_evaluator.TestDivision -v`
**EXPECTED:** 5 tests, all pass. `calc("7/2")` → 3.5. `calc("1/0")` raises `EvalError`.
**WHERE:** `calc/evaluator.py` (`evaluate` function, `EvalError` class)

### D3 — result type
**WHAT:** Whole-valued results are `int`; non-whole are `float`. `"4/2"` → `2` (int), `"7/2"` → `3.5` (float).
**HOW:** `python -m unittest calc.test_evaluator.TestResultType -v`
**EXPECTED:** 5 tests, all pass. `isinstance(calc("4/2"), int)` is True. `isinstance(calc("7/2"), float)` is True.
**WHERE:** `calc/evaluator.py` (`_coerce` helper applies the rule at every arithmetic operation)

### D4 — CLI
**WHAT:** `python calc.py "2+3*4"` prints `14`, exits 0. `python calc.py "1 +"` prints error to stderr, exits non-zero.
**HOW:**
```bash
python calc.py "2+3*4"     # stdout: 14, exit 0
python calc.py "(2+3)*4"   # stdout: 20, exit 0
python calc.py "7/2"       # stdout: 3.5, exit 0
python calc.py "4/2"       # stdout: 2, exit 0
python calc.py "1/0"       # stderr: error: division by zero, exit 1
python calc.py "1 +"       # stderr: error: unexpected token ..., exit 1
```
**WHERE:** `calc.py` (top-level CLI)

### D5 — tests green + end-to-end
**WHAT:** Full suite (lex + parse + eval) passes with 0 failures, 68 tests total.
**HOW:** `python -m unittest -q`
**EXPECTED:** `Ran 68 tests in 0.0xxs\nOK`
**WHERE:** `calc/test_lexer.py` (25), `calc/test_parser.py` (23), `calc/test_evaluator.py` (20)