LanguageFeatures/Inline-classes/composing_inline_classes_A05_t05

[alexmarkov]

This test has an inline class without an instance variable (field):

co19/LanguageFeatures/Inline-classes/composing_inline_classes_A05_t05.dart

Lines 33 to 35 in fd0c7c2

	inline class V3 {
	num foo() => 42;
	}

Spec:

A compile-time error occurs if the inline class does not declare any instance variables, and if it declares two or more instance variables.