Struct darling_core::error::Error

pub struct Error { /* fields omitted */ }

An error encountered during attribute parsing.

Given that most errors darling encounters represent code bugs in dependent crates, the internal structure of the error is deliberately opaque.

Methods

impl Error

fn custom<T: Display>(msg: T) -> Self

Creates a new error with a custom message.

fn duplicate_field(name: &str) -> Self

Creates a new error for a field that appears twice in the input.

fn missing_field(name: &str) -> Self

Creates a new error for a non-optional field that does not appear in the input.

fn unknown_field(name: &str) -> Self

Creates a new error for a field name that appears in the input but does not correspond to a known field.

fn unsupported_format(format: &str) -> Self

fn unexpected_type(ty: &str) -> Self

Creates a new error for a field which has an unexpected literal type.

fn unknown_value(value: &str) -> Self

Creates a new error for a value which doesn't match a set of expected literals.

fn too_few_items(min: usize) -> Self

Creates a new error for a list which did not get enough items to proceed.

fn too_many_items(max: usize) -> Self

Creates a new error when a list got more items than it supports. The max argument is the largest number of items the receiver could accept.

fn multiple(errors: Vec<Error>) -> Self

Bundle a set of multiple errors into a single Error instance.

Panics

This function will panic if errors.is_empty() == true.

fn flatten(self) -> Self

Recursively converts a tree of errors to a flattened list.

fn at<T: Display>(self, location: T) -> Self

Adds a location to the error, such as a field or variant. Locations must be added in reverse order of specificity.

fn len(&self) -> usize

Gets the number of individual errors in this error.

This function should never return 0, as it shouldn't be possible to construct a multi-error from an empty Vec.

Trait Implementations

impl Debug for Error

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl StdError for Error

fn description(&self) -> &str

A short description of the error.

fn cause(&self) -> Option<&StdError>

The lower-level cause of this error, if any.

impl Display for Error

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

Formats the value using the given formatter.

impl IntoIterator for Error

type Item = Error

The type of the elements being iterated over.

type IntoIter = IntoIter

Which kind of iterator are we turning this into?

fn into_iter(self) -> IntoIter

Creates an iterator from a value.