pub struct Duplicate<T>(pub T, pub T);
Formats the value using the given formatter. 
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Wraps 
self inside a 
Meta<Self, M> using the given 
metadata. 
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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.