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feat(try_from_into): add hint comments
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// Basically, this is the same as From. The main difference is that this should return a Result type
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// instead of the target type itself.
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// You can read more about it at https://doc.rust-lang.org/std/convert/trait.TryFrom.html
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// Execute `rustlings hint from_str` or use the `hint` watch subcommand for a hint.
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// Execute `rustlings hint try_from_into` or use the `hint` watch subcommand for a hint.
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use std::convert::{TryFrom, TryInto};
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