# REVIEW — phase eval (Adversary)

## Gates

### eval/D1: PASS @2026-06-15T06:07Z

Cold-verified all 5 plan cases:
- `"2+3*4"` → 14 ✓
- `"(2+3)*4"` → 20 ✓
- `"8-3-2"` → 3 ✓
- `"-2+5"` → 3 ✓
- `"2*-3"` → -6 ✓

`python -m unittest calc.test_evaluator.TestD1Arithmetic -v`: 5/5 ok.

Break-it probes: `3+4+5`→12, `10-2*3`→4, `-(3+4)`→-7, `2*3+4*5`→26, `-(-5)`→5 — all correct.

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### eval/D2: PASS @2026-06-15T06:07Z

Cold-verified:
- `"7/2"` → 3.5 (true division) ✓
- `"1/0"` raises `EvalError("division by zero")`, NOT bare `ZeroDivisionError` ✓

`python -m unittest calc.test_evaluator.TestD2Division -v`: 3/3 ok.

Break-it probes: `0/0` raises EvalError ✓, `1/(2-2)` raises EvalError ✓.

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### eval/D3: PASS @2026-06-15T06:07Z

Cold-verified:
- `format_result(2.0)` → `"2"` (no `.0`) ✓
- `format_result(3.5)` → `"3.5"` ✓
- `calc.py "4/2"` prints `2` ✓
- `calc.py "7/2"` prints `3.5` ✓

`python -m unittest calc.test_evaluator.TestD3ResultType -v`: 5/5 ok.

Break-it probes: integers (`14`, `0`, `-6`), non-whole floats (`3.5`, `-3.5`), whole floats (`2.0`, `100.0`) — all formatted correctly.

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### eval/D4: PASS @2026-06-15T06:08Z

Cold-verified exact plan spot-checks:
- `calc.py "2+3*4"` → stdout `14`, exit 0 ✓
- `calc.py "(2+3)*4"` → stdout `20`, exit 0 ✓
- `calc.py "7/2"` → stdout `3.5`, exit 0 ✓
- `calc.py "4/2"` → stdout `2`, exit 0 ✓
- `calc.py "1/0"` → stderr `error: division by zero`, exit 1 ✓
- `calc.py "1 +"` → stderr `error: ...`, exit 1 ✓

`python -m unittest calc.test_evaluator.TestD4CLI -v`: 6/6 ok.

Break-it probes: no traceback on error ✓, error goes to stderr not stdout ✓, no-args exits 1 ✓.

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### eval/D5: PASS @2026-06-15T06:08Z

Cold-verified:
- `python -m unittest -q`: **50 tests in 0.210s — OK** ✓
- All 6 plan verification commands produce correct output / exit codes ✓
- No regression in lex or parse suites (19 lex + 12 parse all still green) ✓
- test_evaluator.py covers D1 (5 tests) + D2 (3 tests) + D3 (5 tests) + D4 (6 tests) = 19 evaluator tests ✓