LibJS: Mark some calls of CreateTemporalDate as infallible

This is an editorial change in the Temporal spec.

See: https://github.com/tc39/proposal-temporal/commit/30344e8

Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp

@@ -668,8 +668,8 @@ JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::to_plain_date)
     // 2. Perform ? RequireInternalSlot(dateTime, [[InitializedTemporalDateTime]]).
     auto* date_time = TRY(typed_this_object(global_object));
 
-    // 3. Return ? CreateTemporalDate(dateTime.[[ISOYear]], dateTime.[[ISOMonth]], dateTime.[[ISODay]], dateTime.[[Calendar]]).
-    return TRY(create_temporal_date(global_object, date_time->iso_year(), date_time->iso_month(), date_time->iso_day(), date_time->calendar()));
+    // 3. Return ! CreateTemporalDate(dateTime.[[ISOYear]], dateTime.[[ISOMonth]], dateTime.[[ISODay]], dateTime.[[Calendar]]).
+    return MUST(create_temporal_date(global_object, date_time->iso_year(), date_time->iso_month(), date_time->iso_day(), date_time->calendar()));
 }
 
 // 5.3.38 Temporal.PlainDateTime.prototype.toPlainYearMonth ( ), https://tc39.es/proposal-temporal/#sec-temporal.plaindatetime.prototype.toplainyearmonth

Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp

@@ -381,8 +381,8 @@ ThrowCompletionOr<BigInt*> add_zoned_date_time(GlobalObject& global_object, BigI
     // 5. Let temporalDateTime be ? BuiltinTimeZoneGetPlainDateTimeFor(timeZone, instant, calendar).
     auto* temporal_date_time = TRY(builtin_time_zone_get_plain_date_time_for(global_object, time_zone, *instant, calendar));
 
-    // 6. Let datePart be ? CreateTemporalDate(temporalDateTime.[[ISOYear]], temporalDateTime.[[ISOMonth]], temporalDateTime.[[ISODay]], calendar).
-    auto* date_part = TRY(create_temporal_date(global_object, temporal_date_time->iso_year(), temporal_date_time->iso_month(), temporal_date_time->iso_day(), calendar));
+    // 6. Let datePart be ! CreateTemporalDate(temporalDateTime.[[ISOYear]], temporalDateTime.[[ISOMonth]], temporalDateTime.[[ISODay]], calendar).
+    auto* date_part = MUST(create_temporal_date(global_object, temporal_date_time->iso_year(), temporal_date_time->iso_month(), temporal_date_time->iso_day(), calendar));
 
     // 7. Let dateDuration be ! CreateTemporalDuration(years, months, weeks, days, 0, 0, 0, 0, 0, 0).
     auto* date_duration = MUST(create_temporal_duration(global_object, years, months, weeks, days, 0, 0, 0, 0, 0, 0));

Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp

@@ -1177,8 +1177,8 @@ JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::to_plain_date)
     // 6. Let temporalDateTime be ? BuiltinTimeZoneGetPlainDateTimeFor(timeZone, instant, calendar).
     auto* temporal_date_time = TRY(builtin_time_zone_get_plain_date_time_for(global_object, &time_zone, *instant, calendar));
 
-    // 7. Return ? CreateTemporalDate(temporalDateTime.[[ISOYear]], temporalDateTime.[[ISOMonth]], temporalDateTime.[[ISODay]], calendar).
-    return TRY(create_temporal_date(global_object, temporal_date_time->iso_year(), temporal_date_time->iso_month(), temporal_date_time->iso_day(), calendar));
+    // 7. Return ! CreateTemporalDate(temporalDateTime.[[ISOYear]], temporalDateTime.[[ISOMonth]], temporalDateTime.[[ISODay]], calendar).
+    return MUST(create_temporal_date(global_object, temporal_date_time->iso_year(), temporal_date_time->iso_month(), temporal_date_time->iso_day(), calendar));
 }
 
 // 6.3.48 Temporal.ZonedDateTime.prototype.toPlainTime ( ), https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime.prototype.toplaintime