Incorrect expectations in LanguageFeatures/Enhanced-Enum/semantics_A06_t02

[alexmarkov]

This test incorrectly tests type parameter of enum values:

co19/LanguageFeatures/Enhanced-Enum/semantics_A06_t02.dart

Lines 31 to 49 in 58f3d57

	enum E<T extends A> {
	e1<A>(),
	e2<B>(),
	e3<C>();
	}
	main() {
	Expect.isTrue(E.values[0] is A);
	Expect.isFalse(E.values[0] is B);
	Expect.isFalse(E.values[0] is C);
	Expect.isTrue(E.values[1] is A);
	Expect.isFalse(E.values[1] is B);
	Expect.isFalse(E.values[1] is C);
	Expect.isTrue(E.values[2] is A);
	Expect.isFalse(E.values[2] is B);
	Expect.isFalse(E.values[2] is C);
	}

E.values[0], E.values[1], E.values[2] are enum values e1, e2 and e3 and have types E<A>, E<B> and E<C>. They are not instances of classes A, B, C, so is tests against those classes result in false.