13b610be03
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Implement three missing JS operators that together unblock 57 Test262 full-suite tests (pass rate 42% → 44%): - delete: reference-aware unary operator that removes object properties, with special handling for member/computed/identifier expressions - void: unary operator that evaluates operand and returns undefined - in: binary operator that checks property existence via prototype chain, gated by allow_in flag to disambiguate from for-in loops The allow_in mechanism (with_no_in helper) prevents the parser from consuming `in` as a binary operator inside for-loop initializers, which would break for-in/for-of parsing. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
16 lines
285 B
JavaScript
16 lines
285 B
JavaScript
// void 0 returns undefined
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console.log(void 0);
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// void expression returns undefined
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console.log(void (1 + 2));
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// void evaluates operand for side effects
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var x = 0;
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void (x = 5);
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console.log(x);
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// void with function call
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function inc() { x = x + 1; }
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void inc();
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console.log(x);
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