Because the message is not really send. Instead it is inlined (you could try to browse the bytecode of the method). Since the system should hide such implementation details, latest Pharo have been modified to track the senders of these inlined message. Nicolas Le 3 mars 2012 13:02, Dario Trussardi <dario.trussardi@tiscali.it> a écrit :

Ciao,

       i work with:

               Pharo-1.0                Latest update: #10517.

       ( but i found the same answer into                                Pharo1.2.2                                Latest update: #12353  )

I have a browser open on Boolean class.

When i select the                or:             method   and click on  the      sender button   the system answer only   ten   methods.

Because ?

Thank,

               Dario