Enum EvalError 

pub enum EvalError {
    EvalParseError(String),
    UnboundVariable {
        name: String,
    },
    TypeError {
        operation: String,
        expected: String,
        actual: String,
        context: String,
    },
    NullInOperation {
        operation: String,
        context: String,
    },
    DivisionByZero {
        expression: String,
    },
    InvalidLiteral {
        literal: String,
        literal_type: String,
        error: String,
    },
}

Comprehensive error type for evaluation failures

Variants

EvalParseError(String)

Parse error from the parser

Tuple Fields

0: String

Error message

UnboundVariable

Variable referenced but not found in value map

Fields

name: String

Variable name

TypeError

Type mismatch in operation

Fields

operation: String

Operation that failed

expected: String

Expected type

actual: String

Actual type found

context: String

Expression context

NullInOperation

NULL used in arithmetic or comparison operation (not IS NULL/IS NOT NULL)

Fields

operation: String

Operation that failed

context: String

Expression context

DivisionByZero

Division by zero

Fields

expression: String

Expression that caused division by zero

InvalidLiteral

Invalid literal format

Fields

literal: String

The literal value

literal_type: String

The expected type

error: String

The parse error

Trait Implementations

impl Clone for EvalError

fn clone(&self) -> EvalError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

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, f: &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 From<&str> for EvalError

fn from(msg: &str) -> Self

Converts to this type from the input type.

impl From<ParseError> for EvalError

fn from(msg: ParseError) -> Self

Converts to this type from the input type.

impl From<String> for EvalError

fn from(msg: String) -> Self

Converts to this type from the input type.

impl PartialEq for EvalError

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