pub enum Expr {
Number(f64),
PrefixExpr {
operator: String,
right: Box<Expr>,
},
InfixExpr {
left: Box<Expr>,
operator: String,
right: Box<Expr>,
},
Fraction {
numerator: Box<Expr>,
denominator: Box<Expr>,
},
}
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.