Sanitise: Fix rescoping of symbols for nested associates #470
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When nested associates are about to be removed, we need to account for that when updating the symbol-scope (a priori). This new logic does this by counting out the nested associates and picking the appropriate one, according to the septh of the symbol in the nest.
I've extended the stat-func test, where this most often triggers.
Note, this looks like a recurrence of the problem in #439 and hopefully should address issue #459 (@ecossevin to confirm).