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What determines what is assigned to Out[]?


All of the following result in % returning 1:

1;

x = 1;

x = 1; x = Null;

Module[{}, x = 1;]

I am starting to see a pattern here. Can anyone explain the exact rule that
determines what gets assigned to the Out[] variable?

This is important because, for example, compare the following fairly
equivalent pieces of code:

Module[{}, m = RandomReal[1, 10000000]; flag = 1;]

Module[{}, flag = 1; m = RandomReal[1, 10000000];]

The former assigns 1 to Out[], whereas the latter assigns a roughly 80MB
lump of random reals to Out[]!



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