Enum ExprError 

pub enum ExprError {
    UnexpectedChar(char),
    BadNumber(String),
    UnknownIdent(String),
    WrongArity {
        func: String,
        expected: usize,
        got: usize,
    },
    UnexpectedToken(String),
    UnexpectedEnd,
    TrailingTokens,
}

Why an expression failed to compile. Evaluation never errors.

Variants

UnexpectedChar(char)

A character the tokenizer does not recognize.

BadNumber(String)

A numeric literal that does not parse as f32.

UnknownIdent(String)

An identifier that is neither a known variable nor function.

WrongArity

A function called with the wrong number of arguments.

Fields

func: String

Function name.

expected: usize

Arity the function requires.

got: usize

Arity supplied.

UnexpectedToken(String)

A token appeared where the grammar did not allow it.

UnexpectedEnd

The expression ended earlier than the grammar allows.

TrailingTokens

Extra tokens remained after a complete expression.

Trait Implementations

impl Clone for ExprError

fn clone(&self) -> ExprError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExprError

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

Formats the value using the given formatter.

impl Display for ExprError

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

Formats the value using the given formatter.

impl Error for ExprError

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 ExprError

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ExprError