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[no subject]

This is one "is an error" condition that is fairly painful: it isn't
determinable by even the most careful amount of flow analysis, much less
a simple syntactic check.

To change "it is an error to destructively modify the pname of a
symbol", it is necessary to either introduce copy-on-write or else
change it to "signals an error". If the former is controversial, would
you accept the latter?