Follow-up Comment #2, bug #19900 (project make):

My apologies.  The problem was my misunderstanding.

In the $(eval) case, $(var) was being expanded as part of the $(eval), which
isn't being done in the context of a rule.  Using $$(var) fixes this because
$(eval) generates a rule containing the string "$(var)", and expansion is
deferred until the rule is applied.

Sorry for wasting your time with this; just close the bug.  And thanks for
pointing me in the right direction.

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