Enum CalculatorError 

#[non_exhaustive]
pub enum CalculatorError {
    Syntax {
        expression: String,
        position: usize,
        found: String,
    },
    UnknownName(String),
    Arity {
        function: String,
        expected: &'static str,
        got: usize,
    },
    DivisionByZero,
    NotFinite,
    TooDeep,
}

Why an expression couldn’t be evaluated.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Syntax

Fields

expression: String

position: usize

found: String

UnknownName(String)

Arity

Fields

function: String

expected: &'static str

got: usize

DivisionByZero

NotFinite

TooDeep

Trait Implementations

impl Clone for CalculatorError

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CalculatorError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for CalculatorError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for CalculatorError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for CalculatorError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for CalculatorError