�

But tempNames is fundamentally broken for closures.

Just to avoid confusing, #tempNames itself looks correct:

tempNames
�� "Answer a SequenceableCollection of the names of the receiver's temporary
�� variables, which are strings."

�� ^ self debuggerMap tempNamesForContext: self

Yes. �That's for ContextPart. �But it doesn't work for CompiledMethod, since temps may differ between a method and its blocks.
�

Right, but weren't we always talking about Contexts?� Because #tempNames of CompiledMethod is different than the thing of contexts, isn't it? It is related to the method trailer.� In fact, I have just checked Squeak 4.3 and CompiledMethod does not even implement #tempNames.� The implementation in Pharo is:

CompiledMethod >> #tempNames
�� self holdsTempNames ifFalse: [^#()].
�� ^self tempNamesString subStrings: ' '

how would it be the correct implementation then?

Thanks