Enum EvalError 

#[non_exhaustive]
pub enum EvalError {
    Unresolved {
        at: NodeId,
    },
    DanglingExpr,
    DivisionByZero {
        at: NodeId,
    },
    Overflow {
        at: NodeId,
    },
    InvalidShift {
        at: NodeId,
    },
    NotIntegral {
        at: NodeId,
    },
    TooDeep,
    MixedOperands {
        at: NodeId,
    },
    NotFloatingOperator {
        at: NodeId,
    },
    NotFixedOperator {
        at: NodeId,
    },
    LongDouble {
        at: NodeId,
    },
}

Why an expression could not be evaluated.

Evaluation of a partially discovered model fails loudly; it never substitutes a default. Spec §3.5.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Unresolved

The tree reached a reference that is not resolved.

Fields

at: NodeId

The expression node that could not be followed.

DanglingExpr

A handle in the tree did not address a live expression node.

DivisionByZero

Division or remainder by zero.

Fields

at: NodeId

The expression node performing the division.

Overflow

The computation left the range of i128.

Fields

at: NodeId

The expression node that overflowed.

InvalidShift

A shift distance was negative or wider than the value.

Fields

at: NodeId

The expression node performing the shift.

NotIntegral

The literal is not integral, so integral evaluation cannot apply.

Fields

at: NodeId

The expression node holding the literal.

TooDeep

The expression nests deeper than evaluation will follow. Bounds the work a hostile snapshot can demand.

MixedOperands

An infix operator combines a floating-point operand with one that is not. IDL 4.2 §7.4.1.4.2: “An infix operator may combine two integer types, floating point types or fixed point types, but not mixtures of these.”

Fields

at: NodeId

The expression node with the mixed operands.

NotFloatingOperator

An operator other than unary + - and binary * / + - over floating-point operands. IDL 4.2 §7.4.1.4.2 admits only those.

Fields

at: NodeId

The expression node performing the operation.

NotFixedOperator

An operator other than unary + - and binary * / + - over fixed-point operands. IDL 4.2 §7.4.1.4.2 admits only those.

Fields

at: NodeId

The expression node performing the operation.

LongDouble

The arithmetic would have to run in long double: the constant is one, an operand is one, or a literal is too large for double and so is one (IDL 4.2 §7.4.1.4.2). This build has no IEEE double-extended or binary128 arithmetic to run it in, and doing it in double instead would round where the clause says not to.

Fields

at: NodeId

The expression node that needs it.

Trait Implementations

impl Clone for EvalError

fn clone(&self) -> Self

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 Eq for EvalError

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: &Self) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for EvalError