pub struct DepsMut<'a, C: CustomQuery = Empty> {
    pub storage: &'a mut dyn Storage,
    pub api: &'a dyn Api,
    pub querier: QuerierWrapper<'a, C>,
}
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.