fix(arc1): Passively introduce attributes (#429)
Ensure that std::sync::Arc is actually used, as this exercise can be compiled using things already learnt in previous exercises.
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@ -6,6 +6,7 @@
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// I AM NOT DONE
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// I AM NOT DONE
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#![forbid(unused_imports)] // Do not change this, (or the next) line.
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use std::sync::Arc;
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use std::sync::Arc;
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use std::thread;
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use std::thread;
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