Poor error recovery when `enum` is used as a parameter name

TypeScript Version: 3.6.2

Search Terms: expression expected reserved word

Code

function converter<Enum>(values: string[], enums: Enum[]): Map<Enum, string> {
	return new Map<Enum, string>(
		enums.map((enum: Enum, index: number) => [ enum, values[index] ])
	);
}

Expected behavior:
After some confusion why this displays so many red curlies, the error should make it clear to me that the reserved word enum is accidentaly being used as an argument name. An error is given on enum saying something along the lines of You cannot use enum as a variable/argument because it is a reserved word.

Actual behavior:
After a LOT of confusion, one realizes that the reserved word enum is accidentally being used as an argument name. An error is given on several parts in the above code, where the most helpful one is Expression expected (ts1109), which is just unnecesarily confusing.

Playground Link

Related Issues:
None that seem related.

Riproduci la diagnostica con il codice fornito nel TypeScript 3.6.2 Playground, quindi confronta gli errori del parser relativi al nome del parametro enum. Migliora l’errore segnalato in modo che identifichi l’uso improprio di una parola riservata senza produrre diagnostica a cascata confusa, quindi verifica il risultato con lo stesso esempio.