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Malte UblandClaude 5.5
34c39e5443
An empty binding pattern still performs its one observable step:
RequireObjectCoercible for `{}` and GetIterator for `[]`. Over a statically
non-nullish source that step is invisible, which is why the empty-pattern
lowering emitted nothing; a checked-dynamic source can be null or undefined
at runtime, where V8 throws.
Emit the runtime null/undefined test for dyn sources in the empty-pattern
branch, and let a JS-file empty object pattern take the source-spelling
message dynDestrCheck already produces for non-empty ones.
Test262 (static-adapted-v6, --workers 8), affected chapters before -> after:
language/statements/class/dstr pass 1518 -> 1526, fail 424 -> 416;
language/expressions/class/dstr pass 1518 -> 1526, fail 424 -> 416. No
pass -> fail.
Co-Authored-By: Claude 5.5 <noreply@anthropic.com>