Struct darling_core::error::Error
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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
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pub fn custom<T: Display>(msg: T) -> Self
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Creates a new error with a custom message.
pub fn duplicate_field(name: &str) -> Self
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Creates a new error for a field that appears twice in the input.
pub fn missing_field(name: &str) -> Self
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Creates a new error for a non-optional field that does not appear in the input.
pub fn unknown_field(name: &str) -> Self
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Creates a new error for a field name that appears in the input but does not correspond to a known field.
pub fn unsupported_format(format: &str) -> Self
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pub fn unexpected_type(ty: &str) -> Self
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Creates a new error for a field which has an unexpected literal type.
pub fn unknown_value(value: &str) -> Self
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Creates a new error for a value which doesn't match a set of expected literals.
pub fn too_few_items(min: usize) -> Self
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Creates a new error for a list which did not get enough items to proceed.
pub fn too_many_items(max: usize) -> Self
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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.
pub fn multiple(errors: Vec<Error>) -> Self
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Bundle a set of multiple errors into a single Error
instance.
Panics
This function will panic if errors.is_empty() == true
.
pub fn flatten(self) -> Self
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Recursively converts a tree of errors to a flattened list.
pub fn at<T: Display>(self, location: T) -> Self
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Adds a location to the error, such as a field or variant. Locations must be added in reverse order of specificity.
pub fn len(&self) -> usize
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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
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fn fmt(&self, __arg_0: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more
impl StdError for Error
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fn description(&self) -> &str
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A short description of the error. Read more
fn cause(&self) -> Option<&StdError>
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The lower-level cause of this error, if any. Read more
impl Display for Error
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fn fmt(&self, f: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more