Invocation() of a macro created via \let references original macro #849
Assume we are defining a macro then copy it via a
If we now want to now have tokens representing the invocation of this macro, we should then be able to use
which we would expect to return a single
This comes from a more complicated scenario I encountered while updating keyval bindings, but I have gotten it down to this very basic example. This caused an infinite loop, making debugging very hard.
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