I started working through PBE8, and in section 3.13 there is a method:

Counter >> printOn: aStream

super printOn: aStream.

aStream nextPutAll: ' with value: ', count printString.

But it returns two warnings:

[printString] No printString inside printOn

Use cascaded nextPutAll:���s instead of #, in #nextPutAll:

It has the option to automatically resolve the cascaded nextPutAll: which results in:

printOn: aStream

super printOn: aStream.

aStream

nextPutAll: ' with value: ';

nextPutAll: count printString

But it still has the warning about printString.