"isNil" "test if self is nil"
perform: method with: x with: y with: z with: a with: b with: c

	| a b c d e f g |

"
	a := 'this is ''good'.
	a := #xxx niceMethod.
	b := -30 xxx nil this.
"

	(jjj xxx: 10 xy) zzz: (10 fuck: 20 you: 40) yyy:  kkk.

"
	$a. 
	$b.
	^true.
	a := b.
	' this is bad
"