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// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
// Copyright (C) 2023 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.plaindate.prototype.toplainyearmonth
description: If a calendar's fields() method returns a field named '__proto__', PrepareTemporalFields should throw a RangeError.
includes: [temporalHelpers.js]
features: [Temporal]
---*/
const calendar = TemporalHelpers.calendarWithExtraFields(['__proto__']);
const date = new Temporal.PlainDate(2023, 5, 1, calendar);
assert.throws(RangeError, () => date.toPlainYearMonth());
reportCompare(0, 0);
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