RCS1220 produces broken suggestion when pattern matching on System.Enum

[NoahStolk]

Product and Version Used:

Roslynator.Analyzers 4.1.1

Steps to Reproduce:

Consider this method:

Enum? Example(object? value)
{
	if (value is Enum)
		return (Enum)value;

	return null;
}

RCS1220 "Use pattern matching instead of combination of 'is' operator and cast operator." is triggered, which is correct. However, it produces a broken suggestion:

if (value is Enum enum) // Does not compile
	return enum;

enum is a keyword, so this code does not compile. The same happens with other keywords, for example if you were to create a class named Static, it produces this code:

if (value is Static static) // Does not compile
	return static;

string (or String) seems to work correctly:

if (value is string x) // OK
	return x;

Actual Behavior:

if (value is Enum enum)
	return enum;

Expected Behavior:

if (value is Enum @enum)
	return @enum;

or

if (value is Enum x)
	return x;