fallback-symbol.js

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// |reftest| skip-if(!this.hasOwnProperty('Intl'))

function IntlFallbackSymbol(constructor) {

    return Object.getOwnPropertySymbols(constructor.call(Object.create(constructor.prototype)))[0];

const dateTimeFormatIntlFallbackSymbol = IntlFallbackSymbol(Intl.DateTimeFormat);

const numberFormatIntlFallbackSymbol = IntlFallbackSymbol(Intl.NumberFormat);

// Intl.DateTimeFormat and Intl.NumberFormat both use the same fallback symbol.

assertEq(dateTimeFormatIntlFallbackSymbol, numberFormatIntlFallbackSymbol);

const intlFallbackSymbol = dateTimeFormatIntlFallbackSymbol;

// The fallback symbol is a Symbol value.

assertEq(typeof intlFallbackSymbol, "symbol");

// Test the description of the fallback symbol.

assertEq(Symbol.prototype.toString.call(intlFallbackSymbol), "Symbol(IntlLegacyConstructedSymbol)");

if (typeof reportCompare === "function")

    reportCompare(true, true);