Names of the variable patterns mismatch the names of captured variables

[chloestefantsova]

In a patterns test a name of the pattern variable b doesn't match the name a of the variable used in the body after the match.

co19/LanguageFeatures/Patterns/variable_A02_t05.dart

Lines 37 to 39 in 74cb5e7

	case ({1: String b}):
	a.expectStaticType<Exactly<String>>();
	return "{1: <String>$a}";

Similarly, in other lines of the same file:

co19/LanguageFeatures/Patterns/variable_A02_t05.dart

Line 50 in 74cb5e7

({1: String b}) => "{1: <String>$a}",

co19/LanguageFeatures/Patterns/variable_A02_t05.dart

Lines 57 to 59 in 74cb5e7

	if (m case ({1: String b})) {
	a.expectStaticType<Exactly<String>>();
	return "{1: <String>$a}";