Enum ReflectError

#[non_exhaustive]
pub enum ReflectError {
    PartiallyInitialized {
        field: Field,
    },
    NoSuchVariant {
        enum_def: EnumDef,
    },
    WrongShape {
        expected: &'static Shape,
        actual: &'static Shape,
    },
    WasNotA {
        expected: &'static str,
        actual: &'static Shape,
    },
    UninitializedField {
        shape: &'static Shape,
        field_name: &'static str,
    },
    UninitializedEnumField {
        shape: &'static Shape,
        field_name: &'static str,
        variant_name: &'static str,
    },
    NoVariantSelected {
        shape: &'static Shape,
    },
    UninitializedValue {
        shape: &'static Shape,
    },
    InvariantViolation {
        invariant: &'static str,
    },
    MissingCharacteristic {
        shape: &'static Shape,
        characteristic: Characteristic,
    },
    OperationFailed {
        shape: &'static Shape,
        operation: &'static str,
    },
    FieldError {
        shape: &'static Shape,
        field_error: FieldError,
    },
    Unknown,
}

Errors that can occur when reflecting on types.

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.

PartiallyInitialized

Tried to build or build_in_place a struct/enum without initializing all fields.

Fields

field: Field

The field that was not initialized.

NoSuchVariant

Tried to set an enum to a variant that does not exist

Fields

enum_def: EnumDef

The enum definition containing all known variants.

WrongShape

Tried to get the wrong shape out of a value — e.g. we were manipulating a String, but .get() was called with a u64 or something.

Fields

expected: &'static Shape

The expected shape of the value.

actual: &'static Shape

The actual shape of the value.

WasNotA

Attempted to perform an operation that expected a struct or something

Fields

expected: &'static str

The name of the expected type.

actual: &'static Shape

The type we got instead

UninitializedField

A field was not initialized during build

Fields

shape: &'static Shape

The shape containing the field

field_name: &'static str

The name of the field that wasn’t initialized

UninitializedEnumField

A field in an enum variant was not initialized during build

Fields

shape: &'static Shape

The enum shape

field_name: &'static str

The name of the field that wasn’t initialized

variant_name: &'static str

The name of the variant containing the field

NoVariantSelected

An enum had no variant selected during build

Fields

shape: &'static Shape

The enum shape

UninitializedValue

A scalar value was not initialized during build

Fields

shape: &'static Shape

The scalar shape

InvariantViolation

An invariant of the reflection system was violated.

Fields

invariant: &'static str

The invariant that was violated.

MissingCharacteristic

Attempted to set a value to its default, but the value doesn’t implement Default.

Fields

shape: &'static Shape

The shape of the value that doesn’t implement Default.

characteristic: Characteristic

The characteristic that is missing.

OperationFailed

An operation failed for a given shape

Fields

shape: &'static Shape

The shape of the value for which the operation failed.

operation: &'static str

The name of the operation that failed.

FieldError

An error occurred when attempting to access or modify a field.

Fields

shape: &'static Shape

The shape of the value containing the field.

field_error: FieldError

The specific error that occurred with the field.

Unknown

An unknown error occurred.

Trait Implementations

impl Debug for ReflectError

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

Formats the value using the given formatter.

impl Display for ReflectError

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

Formats the value using the given formatter.

impl Error for ReflectError

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.