> Please, how does it break the stack semantics?
I am asking because I think that it is easy to implement such a builtin macro.
E.g. popMacro() can be changed such that it returns 1 if an macro was deleted
and 0 if no macro was deleted. After that it will be easy to call popMacro() in
some function similar to doUndefine() until popMacro() returns 0.
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