pub struct Year {
    pub require: bool,
    pub field: String,
    pub mode: String,
    pub title: String,
    pub def: u64,
    pub show: bool,
    pub describe: String,
}
Immutably borrows from an owned value. 
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Mutably borrows from an owned value. 
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Returns the argument unchanged.
Calls U::from(self).
That is, this conversion is whatever the implementation of
From<T> for U chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.