While I'm trying to argue why the proposed solution is not a full solution to
the proposed problem, I don't even think that the proposed problem is a
problem. Here's why: if you make a call foo(arg) and never use arg after that,
then you don't care if arg gets moved or borrowed. And if you try to use arg
afterwards and foo did in fact move it previously, then your IDE is going to
tell you about it by drawing a red squiggly line under that incorrect use of
arg.
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