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docs: mention flatten in the options2 hint

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Will Hayworth 2021-01-03 03:42:39 -08:00
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info.toml
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@ -583,8 +583,7 @@ https://doc.rust-lang.org/rust-by-example/flow_control/while_let.html
Remember that Options can be stacked in if let and while let.
For example: Some(Some(variable)) = variable2
Also see Option::flatten
"""
[[exercises]]