Where did variable = null as “object destroying” come from?

Question

Working on a number of legacy systems written in various versions of .NET, across many different companies, I keep finding examples of the following pattern:

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Answer 1

May be the convention of assigning null originated from the fact that had foo been an instance variable instead of a local variable, you should remove the reference before GC can collect it. Someone slept during the first sentence and started nullifying all their variables; the crowd followed.