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Joe Savona
b69afe0506
These examples previously errored all the way in codegen, when we detected that a value block (eg a `while` test expression) was declaring a new variable. We now detect this in LeaveSSA and error. The actual fix is a bit tricky, we'd need to add a new declaration in the nearest block scope (or selectively not DCE the declaration if its reassigned in just this way).