Follow-up Comment #2, bug #63040 (project make):
Argh. This export-to-shell-function change is the gift that keeps on giving.
I guess the best thing to do is, rather than expanding a recursive variable to
the empty string, we expand it to its contents without trying to further
expand it to avoid the recursion.
That could be weird. Definitely need to think carefully about this, probably
after I have my tea.
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