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.

Reproduce the diagnostic with the provided code in the TypeScript 3.6.2 Playground, then compare the parser's errors around the enum parameter name. Improve the reported error so it identifies the reserved-word misuse without producing confusing cascading diagnostics, and verify the result against the same example.