Enum ValidationReason 

#[non_exhaustive]
pub enum ValidationReason {
    Missing,
    OutOfRange {
        details: &'static str,
    },
    BadShape {
        details: &'static str,
    },
    Precondition {
        details: &'static str,
    },
}

Canonical validation-failure modes emitted by structured error variants.

Variants carry &'static str detail slots where applicable so consumers get actionable context without paying the cost of a heap allocation. Missing names the field itself as the whole reason; structured call sites still carry a field: &'static str alongside this enum to make the combination self-describing.

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.

Missing

The field was required but was not supplied.

OutOfRange

The field was out of the documented acceptable range.

Fields

details: &'static str

Narrow explanation of the out-of-range condition.

BadShape

The field did not match the documented shape or format.

Fields

details: &'static str

Narrow explanation of the shape violation.

Precondition

The field violated a documented precondition for the operation.

Fields

details: &'static str

Narrow explanation of the violated precondition.

Trait Implementations

impl Clone for ValidationReason

fn clone(&self) -> ValidationReason

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ValidationReason

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

Formats the value using the given formatter.

impl Display for ValidationReason

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

Formats the value using the given formatter.

impl Eq for ValidationReason

impl Error for ValidationReason

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 ValidationReason

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