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The ContainsArguments only returns true for `IdentifierReference : Identifier`, so a label named `arguments` and a `break`/`continue` targeting it are valid inside class field initializers and static blocks, just like `"use strict"; arguments: 1` is valid elsewhere. Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>
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The ContainsArguments only returns true for
IdentifierReference : Identifier, so a label namedargumentsand abreak/continuetargeting it are valid inside class field initializers and static blocks, just like"use strict"; arguments: 1is valid elsewhere.Assisted-by: Claude Opus 5.5 noreply@anthropic.com
Among popular browsers: only JSC correctly allows this case, both FF and V8 incorrectly reject it.