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Implement Error, TypeError, ReferenceError, SyntaxError, RangeError, EvalError, and URIError as proper constructable globals with correct prototype chains. Internal runtime errors (from null property access, undeclared variables, TDZ violations, etc.) are now converted to proper Error objects when caught in try/catch, enabling instanceof checks and the Test262 assert.throws() pattern. Key design decisions: - native_body field on JsFunction for Rust-implemented constructor bodies - Engine-private ErrorPrototypes cache on Environment (immune to shadowing) - #[inline(never)] extraction of native body dispatch to preserve stack frame size - Fix JsValue::Function identity comparison (PartialEq and strict_eq) Promotes 72 previously-failing js262 tests to pass (501 pass, 215 known_fail). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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2 lines
42 B
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f is not a constructor (at line 4, col 3)
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