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Under Minify, inline VarDefs used only once when we can.
During the optimizer, when emitting a `VarDef(x, ..., rhs)`, we try to inline it if it has been used exactly once. In order to do that, we look at the `body` in which it will be available, and replace its only occurrence if it occurs in the first evaluation context following only pure subexpressions. See the long comment in the code for more details.
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