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Re: macroexpansion environments
What the examples do when compiled isn't the point. They needn't even
print anything at compile time (and also needn't cause an error).
I agree that the examples constitute programs whose semantics aren't
well-defined. What bothers me is how innocuously similar the two
cases are and that macros expanding into declarations ought to work
"like you'd expect", but don't and can't.