Enum EvalError 

pub enum EvalError {
    Empty,
    UnexpectedToken,
    UnknownUnit(String),
    DivByZero,
    ClampArity(usize),
    UnsupportedFunction(String),
    Malformed,
}

Errors from parse + evaluate phases.

Variants

Empty

Empty expression body.

UnexpectedToken

Unrecognised token in a place we expected an operand or operator.

UnknownUnit(String)

Unknown unit (e.g. 12foo).

DivByZero

Division by zero.

ClampArity(usize)

clamp(a, b, c) requires exactly three arguments.

UnsupportedFunction(String)

Function name we know about but don’t yet evaluate (e.g. sin, mod).

Malformed

Parser couldn’t balance brackets / saw EOF mid-expression.

Trait Implementations

impl Debug for EvalError

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

Formats the value using the given formatter.

impl Display for EvalError

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

Formats the value using the given formatter.

impl Error for EvalError

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 EvalError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for EvalError