"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 |

	< primitive: 10 >
"
	a := 'this is ''good'.
	a := #xxx niceMethod.
"
	b := -30 xxx nil this.
	"instanceClass := 10."
	literals := 20.
	Win32Errors := 10.

	(jjj xxx: 10 xy) zzz: (10 fuck: 20 you: 40) yyy:  kkk.
	[ spec plus:  20]