Enum knightrs::Error

pub enum Error {
    DivisionByZero {
        kind: &'static str,
    },
    Domain {
        message: &'static str,
    },
    UnknownIdentifier {
        identifier: Box<str>,
    },
    InvalidOperand {
        func: char,
        operand: &'static str,
    },
    UndefinedConversion {
        into: &'static str,
        kind: &'static str,
    },
    Quit(i32),
    Parse(ParseError),
    InvalidString(InvalidChar),
    Io(Error),
    Custom(Box<dyn ErrorTrait>),
}

An error occurred whilst executing a knight program.

Variants

DivisionByZero

A division (or modulus) by zero was attempted.

Fields of DivisionByZero

kind: &'static str

What kind of error it is—power, modulo, or division.

Domain

Fields of Domain

message: &'static str

UnknownIdentifier

An unknown identifier was attempted to be dereferenced.

Fields of UnknownIdentifier

identifier: Box<str>

The identifier at fault.

InvalidOperand

A function was executed with an invalid operand.

Fields of InvalidOperand

func: char

The function that was attempted.

operand: &'static str

The type of the operand.

UndefinedConversion

A conversion was attempted for a type which doesn’t implement it.

This is only used for Value::Variable and Value::Function, as all other types have well-defined conversion semantics.

Fields of UndefinedConversion

into: &'static str

The resulting type, had the conversion been defined.

kind: &'static str

The kind that didnt implement the conversion.

Quit(i32)

Exit with the given status code.

Parse(ParseError)

An error occurred whilst parsing (i.e. EVAL failed).

InvalidString(InvalidChar)

An invalid string was encountered.

Io(Error)

An i/o error occurred (i.e. ` or PROMPT failed).

Custom(Box<dyn ErrorTrait>)

An error class that can be used to raise other, custom errors.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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

The lower-level source of this error, if any.

fn backtrace(&self) -> Option<&Backtrace>

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

Returns a stack backtrace, if available, of where this error occurred.

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

impl From<Error> for Error

fn from(err: Error) -> Self

Performs the conversion.

impl From<InvalidChar> for Error

fn from(err: InvalidChar) -> Self

Performs the conversion.

impl From<ParseError> for Error

fn from(err: ParseError) -> Self

Performs the conversion.