I don't see why one should assume that "watch for the value of a particular variable to change" should include "and it might change because a whole different variable comes into existence because you called the function again".

Feel free to implement your own semantics for "watch". This took me a whole few minutes, including testing it. But when I implement semantics for "watch a variable", I actually want to watch a variable, not "watch whichever instance of a whole class of related variables is currently in scope, if any".

Another benefit with my approach is that I get notified of changes that happen to the value of the watched variable even when it isn't currently in scope under the same name. That's actually the type of thing that makes "what the heck is changing $x?!" tricky to find which might actually motivate me to want a debugger's "watch" feature. *shrug*

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