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func test():
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var unassigned
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print(unassigned)
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unassigned = "something" # Assigned only after use.
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var a
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print(a) # Unassigned, warn.
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if a: # Still unassigned, warn.
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a = 1
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print(a) # Assigned (dead code), don't warn.
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print(a) # "Maybe" assigned, don't warn.
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