[Vm-dev] [Pharo-project] is there a way to avoid all the #tryNamedPrimitive:with: * in ProtoObject

[Igor Stasenko]

Another reason why we need such prim: have you tried to debug a debugger?
You can't , because there is a simulation guard:

       <primitive: 19> "Simulation guard"
       "If successful, push result and return resuming context,
               else ^ PrimitiveFailToken"
       (primitiveIndex = 19) ifTrue:
               [Smalltalk tools
                       debugContext: self
                       label:'Code simulation error'
                       contents: nil].

This is because you cannot instruct VM that the code you stepping over
should not escape out of your control.