Enum Expression 

pub enum Expression {
    UnknownSymbol(u64),
    UnknownVariable(u32),
    InvalidType,
    Overflow,
    DivideByZero,
    InvalidStack,
    ShadowedVariable,
    UndefinedExtern(String),
    ExternEvalError(String, String),
}

Datalog expression execution failure

Variants

UnknownSymbol(u64)

UnknownVariable(u32)

InvalidType

Overflow

DivideByZero

InvalidStack

ShadowedVariable

UndefinedExtern(String)

ExternEvalError(String, String)

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Expression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expression

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

Formats the value using the given formatter.

impl Display for Expression

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

Formats the value using the given formatter.

impl Error for Expression

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 Expression

fn eq(&self, other: &Expression) -> 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 Eq for Expression

impl StructuralPartialEq for Expression