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Local variable scoping
======================
With type inferrence (including name-based type inferrence),
it is possible to end up with code like this:
if is_red
item <- red_item
else
item <- blue_item
end
add items item
Should it require a declaration before the `if`?
Loops DON'T have the same issue!
for item in items
process_item item
last <- item
end
# Compilation error: `last` might not be set at this point
set_active_item last
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