# Enum pest::error::ErrorVariant

source · [−]

    pub enum ErrorVariant<R> {
        ParsingError {
            positives: Vec<R>,
            negatives: Vec<R>,
        },
        CustomError {
            message: String,
        },
    }

Expand description

Different kinds of parsing errors.

## Variants

### `ParsingError`

#### Fields

`positives: Vec<R>`

Positive attempts

`negatives: Vec<R>`

Negative attempts

Generated parsing error with expected and unexpected `Rule`s

### `CustomError`

#### Fields

`message: String`

Short explanation

Custom error with a message

## Implementations

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### impl<R: RuleType> ErrorVariant<R>

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#### pub fn message(&self) -> Cow<'_, str>

Returns the error message for `ErrorVariant`

If `ErrorVariant` is `CustomError`, it returns a `Cow::Borrowed` reference to `message`. If `ErrorVariant` is `ParsingError`, a `Cow::Owned` containing “expected ErrorVariant::ParsingError::positives ErrorVariant::ParsingError::negatives” is returned.

##### Examples

    let variant = ErrorVariant::<()>::CustomError {
        message: String::from("unexpected error")
    };

    println!("{}", variant.message());

## Trait Implementations

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### impl<R: Clone> Clone for ErrorVariant<R>

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#### fn clone(&self) -> ErrorVariant<R>

Returns a copy of the value. Read more

1.0.0 · source

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

Performs copy-assignment from `source`. Read more

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### impl<R: Debug> Debug for ErrorVariant<R>

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

Formats the value using the given formatter. Read more

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### impl<R: RuleType> Display for ErrorVariant<R>

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

Formats the value using the given formatter. Read more

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### impl<R> Error for ErrorVariant<R> where
Self: Debug + Display,

1.30.0 · source

#### fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any. Read more

1.0.0 · source

#### fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

Read more
1.0.0 · source

#### fn cause(&self) -> Option<&dyn Error>

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

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#### fn provide(&'a self, req: &mut Demand<'a>)

🔬 This is a nightly-only experimental API. (`error_generic_member_access`)

Provides type based access to context intended for error reports. Read more

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### impl<R: Hash> Hash for ErrorVariant<R>

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#### fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given `Hasher`. Read more

1.3.0 · source

#### fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,

Feeds a slice of this type into the given `Hasher`. Read more

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### impl<R: PartialEq> PartialEq<ErrorVariant<R>> for ErrorVariant<R>

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#### fn eq(&self, other: &ErrorVariant<R>) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

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#### fn ne(&self, other: &ErrorVariant<R>) -> bool

This method tests for `!=`.

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### impl<R: Eq> Eq for ErrorVariant<R>

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### impl<R> StructuralEq for ErrorVariant<R>

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### impl<R> StructuralPartialEq for ErrorVariant<R>

## Auto Trait Implementations

### impl<R> RefUnwindSafe for ErrorVariant<R> where
R: RefUnwindSafe,

### impl<R> Send for ErrorVariant<R> where
R: Send,

### impl<R> Sync for ErrorVariant<R> where
R: Sync,

### impl<R> Unpin for ErrorVariant<R> where
R: Unpin,

### impl<R> UnwindSafe for ErrorVariant<R> where
R: UnwindSafe,

## Blanket Implementations

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### impl<T> Any for T where
T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more

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### impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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### impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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### impl<T> From<T> for T

const: unstable · source

#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T where
U: From<T>,

const: unstable · source

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for T where
T: Clone,

#### type Owned = T

The resulting type after obtaining ownership.

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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

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### impl<T> ToString for T where
T: Display + ?Sized,

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#### default fn to_string(&self) -> String

Converts the given value to a `String`. Read more

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### impl<T, U> TryFrom<U> for T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

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### impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.