defclass A [ a ] {
	defun :* init1() {
		| b |
		set b (+ 1 2);
		set a b;
		printf "init to %d\n" a;
		return self;
	};

	{
		## this must not be allowed at this level. if it's allowed,
		## it should be at the top-level which is above the class level. this is confusing.
		| j | ##ERROR: syntax error - variable declaration disallowed in class init scope
		set j 20;
		printf ">>> %d\n" j;
	}

	defun :* init2() {
		| b |
		set b (+ 10 20);
		set a b;
		printf "init to %d\n" a;
		return self;
	};
};

---

defun String length() { ##ERROR: syntax error - no argument list
}

---

class A [ 10 ] { ##ERROR: syntax error - invalid name - not symbol in tuple - 10
}

---

class A [ a := 20 ] { ##ERROR: syntax error - := disallowed
}

---
class A [ [ [a] ] ] { ##ERROR: syntax error - not variable name
}

---
class A [ a + ] { ##ERROR: syntax error - prohibited binary operator - +
}

---
class A [ + ] { ##ERROR: syntax error - prohibited binary operator - +
}