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The parser had no arm for `TokenKind::Plus` in `parse_unary` and the AST had no `UnaryOp::Plus` variant, so `+x` errored with "unexpected token: '+'". Wired through end-to-end: - AST: add `UnaryOp::Plus` variant - Parser: handle `Plus` in `parse_unary`, mirroring `Neg` - Bytecode compiler: emit `Opcode::ToNumber` (already existed) for Plus - AST interpreter: `eval_unary` arm performing `coerce_to_number` Promoted 26 Test262 known_fail cases that exercised unary `+` directly or transitively (exponentiation A1-A18, abstract/strict comparisons, ASI tests). Test262 pass rate: 768 → 794 (73% → 75%). Found while loading google.com — Google's bootstrap calls `eval(...)` with code containing `k(+(f=...))`. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>