When a single-use function is inlined late enough in the optimization
process, and when the body has the only use of some variable computed
by an expression that can be move in place of the use in the inlined
function (but not in the non-inlined function), then it's a problem if
the function binding isn't pruned away early enough. Make sure the
binding to the function is marked as unused after the function is
inlined.
This bug was exposed by a recent change to the "dssl2" package.
cd9071cb9b