" isKindOf:/respondsTo: with undefined receiver" ([ MyUndefinedGlobal isKindOf: Point ] on: Error do: [true]) ifTrue: [ self print: '#isKindOf: test failed' ]! ([ MyUndefinedGlobal respondsTo: #yourself ] on: Error do: [true]) ifTrue: [ self print: '#respondsTo: test failed' ]!
"IKO with nil argument" (5@3 isKindOf: nil) ifTrue: [ self error: 'Wrong result' ]