Some suggested corrections of the tests for the named-arguments-anywhere language features

[chloestefantsova]

Some of the tests for the named-arguments-anywhere language feature aren't passing. I looked into them, and I think the tests should be updated.

Test co19/LanguageFeatures/Named-arguments-anywhere/constructor_t08

In this test the error is due to class A having a default constructor instead of the one taking three arguments. I think it's just a typo, and if C is corrected to A in line 20, the test passes.

co19/LanguageFeatures/Named-arguments-anywhere/constructor_t08.dart

Lines 17 to 23 in 063592e

	class A<T> {
	String log = "";
	C(T x, T y, {T? z}) {
	log = "x=$x, y=$y, z=$z";
	}
	}

Test co19/LanguageFeatures/Named-arguments-anywhere/constructor_t06

I think the failure in this test is due to the typo too: in line 28 it should say T x (with the space) instead of Tx.

co19/LanguageFeatures/Named-arguments-anywhere/constructor_t06.dart

Line 28 in 063592e

factory C.f2(Tx, T y, {T? z}) = D;

Test co19/LanguageFeatures/Named-arguments-anywhere/constructor_t02

The failures in this test are in the lines where the type argument is paced after the name of the named constructor. I think it should be a compile-time error indeed, and the argument should to after the name of the class and before the name of the constructor. CC-ing @eernstg to confirm.

co19/LanguageFeatures/Named-arguments-anywhere/constructor_t02.dart

Lines 33 to 35 in 063592e

	Expect.equals("x=1, y=2, z=3", C.named<int>(1, 2, z: 3).log);
	Expect.equals("x=1, y=2, z=3", C.named<int>(z: 3, 1, 2).log);
	Expect.equals("x=1, y=2, z=3", C.named<int>(1, z: 3, 2).log);